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Finding the Fourth Proportional to 712,757.70, 983,602.71 and 390,487.86

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Solution

The fourth proportional to 712,757.70, 983,602.71 and 390,487.86 is: 538,871.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,757.70 : 983,602.71 = 390,487.86 : x
  2. Step 2: Convert to fraction form
    712,757.70/983,602.71 = 390,487.86/x
  3. Step 3: Cross multiply
    712,757.70x = 983,602.71 × 390,487.86
  4. Step 4: Simplify right side
    712,757.70x = 384,084,917,318.10
  5. Step 5: Solve for x
    x = 384,084,917,318.10/712,757.70
  6. Step 6: Final answer
    x = 538,871.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.