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Finding the Fourth Proportional to 712,638, 983,393.46 and 390,351.96

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Solution

The fourth proportional to 712,638, 983,393.46 and 390,351.96 is: 538,659.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,638 : 983,393.46 = 390,351.96 : x
  2. Step 2: Convert to fraction form
    712,638/983,393.46 = 390,351.96/x
  3. Step 3: Cross multiply
    712,638x = 983,393.46 × 390,351.96
  4. Step 4: Simplify right side
    712,638x = 383,869,564,562.18
  5. Step 5: Solve for x
    x = 383,869,564,562.18/712,638
  6. Step 6: Final answer
    x = 538,659.97

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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.