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Finding the Fourth Proportional to 713,139.30, 984,139.94 and 390,842.46

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Solution

The fourth proportional to 713,139.30, 984,139.94 and 390,842.46 is: 539,366.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,139.30 : 984,139.94 = 390,842.46 : x
  2. Step 2: Convert to fraction form
    713,139.30/984,139.94 = 390,842.46/x
  3. Step 3: Cross multiply
    713,139.30x = 984,139.94 × 390,842.46
  4. Step 4: Simplify right side
    713,139.30x = 384,643,675,133.85
  5. Step 5: Solve for x
    x = 384,643,675,133.85/713,139.30
  6. Step 6: Final answer
    x = 539,366.82

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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.