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Finding the Fourth Proportional to 717,649, 990,400.98 and 395,359.72

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Solution

The fourth proportional to 717,649, 990,400.98 and 395,359.72 is: 545,621.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,649 : 990,400.98 = 395,359.72 : x
  2. Step 2: Convert to fraction form
    717,649/990,400.98 = 395,359.72/x
  3. Step 3: Cross multiply
    717,649x = 990,400.98 × 395,359.72
  4. Step 4: Simplify right side
    717,649x = 391,564,654,140.53
  5. Step 5: Solve for x
    x = 391,564,654,140.53/717,649
  6. Step 6: Final answer
    x = 545,621.40

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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.