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Finding the Fourth Proportional to 712,603.13, 983,392.56 and 390,318.62

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Solution

The fourth proportional to 712,603.13, 983,392.56 and 390,318.62 is: 538,639.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,603.13 : 983,392.56 = 390,318.62 : x
  2. Step 2: Convert to fraction form
    712,603.13/983,392.56 = 390,318.62/x
  3. Step 3: Cross multiply
    712,603.13x = 983,392.56 × 390,318.62
  4. Step 4: Simplify right side
    712,603.13x = 383,836,426,937.47
  5. Step 5: Solve for x
    x = 383,836,426,937.47/712,603.13
  6. Step 6: Final answer
    x = 538,639.83

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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.