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Finding the Fourth Proportional to 817,907.80, 1,226,861.70 and 256,941.40

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Solution

The fourth proportional to 817,907.80, 1,226,861.70 and 256,941.40 is: 385,412.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    817,907.80 : 1,226,861.70 = 256,941.40 : x
  2. Step 2: Convert to fraction form
    817,907.80/1,226,861.70 = 256,941.40/x
  3. Step 3: Cross multiply
    817,907.80x = 1,226,861.70 × 256,941.40
  4. Step 4: Simplify right side
    817,907.80x = 315,231,562,804.38
  5. Step 5: Solve for x
    x = 315,231,562,804.38/817,907.80
  6. Step 6: Final answer
    x = 385,412.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.