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Finding the Fourth Proportional to 717,612.76, 991,312.86 and 679,821.40

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Solution

The fourth proportional to 717,612.76, 991,312.86 and 679,821.40 is: 939,107.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,612.76 : 991,312.86 = 679,821.40 : x
  2. Step 2: Convert to fraction form
    717,612.76/991,312.86 = 679,821.40/x
  3. Step 3: Cross multiply
    717,612.76x = 991,312.86 × 679,821.40
  4. Step 4: Simplify right side
    717,612.76x = 673,915,696,323.20
  5. Step 5: Solve for x
    x = 673,915,696,323.20/717,612.76
  6. Step 6: Final answer
    x = 939,107.74

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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.