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Finding the Fourth Proportional to 256,710.80, 385,131.08 and 207,240.40

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Solution

The fourth proportional to 256,710.80, 385,131.08 and 207,240.40 is: 310,912.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,710.80 : 385,131.08 = 207,240.40 : x
  2. Step 2: Convert to fraction form
    256,710.80/385,131.08 = 207,240.40/x
  3. Step 3: Cross multiply
    256,710.80x = 385,131.08 × 207,240.40
  4. Step 4: Simplify right side
    256,710.80x = 79,814,719,071.63
  5. Step 5: Solve for x
    x = 79,814,719,071.63/256,710.80
  6. Step 6: Final answer
    x = 310,912.98

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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.