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Finding the Fourth Proportional to 713,139.42, 984,140.10 and 390,842.58

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Solution

The fourth proportional to 713,139.42, 984,140.10 and 390,842.58 is: 539,366.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,139.42 : 984,140.10 = 390,842.58 : x
  2. Step 2: Convert to fraction form
    713,139.42/984,140.10 = 390,842.58/x
  3. Step 3: Cross multiply
    713,139.42x = 984,140.10 × 390,842.58
  4. Step 4: Simplify right side
    713,139.42x = 384,643,855,765.46
  5. Step 5: Solve for x
    x = 384,643,855,765.46/713,139.42
  6. Step 6: Final answer
    x = 539,366.98

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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.