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Finding the Fourth Proportional to 926,390.80, 1,389,715.80 and 393,907.60

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Solution

The fourth proportional to 926,390.80, 1,389,715.80 and 393,907.60 is: 590,916.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    926,390.80 : 1,389,715.80 = 393,907.60 : x
  2. Step 2: Convert to fraction form
    926,390.80/1,389,715.80 = 393,907.60/x
  3. Step 3: Cross multiply
    926,390.80x = 1,389,715.80 × 393,907.60
  4. Step 4: Simplify right side
    926,390.80x = 547,419,615,460.08
  5. Step 5: Solve for x
    x = 547,419,615,460.08/926,390.80
  6. Step 6: Final answer
    x = 590,916.51

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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.