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Finding the Fourth Proportional to 713,139.67, 984,140.45 and 390,842.83

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Solution

The fourth proportional to 713,139.67, 984,140.45 and 390,842.83 is: 539,367.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,139.67 : 984,140.45 = 390,842.83 : x
  2. Step 2: Convert to fraction form
    713,139.67/984,140.45 = 390,842.83/x
  3. Step 3: Cross multiply
    713,139.67x = 984,140.45 × 390,842.83
  4. Step 4: Simplify right side
    713,139.67x = 384,644,238,595.47
  5. Step 5: Solve for x
    x = 384,644,238,595.47/713,139.67
  6. Step 6: Final answer
    x = 539,367.33

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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.