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Finding the Fourth Proportional to 717,398.85, 990,055.18 and 395,108.86

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Solution

The fourth proportional to 717,398.85, 990,055.18 and 395,108.86 is: 545,274.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,398.85 : 990,055.18 = 395,108.86 : x
  2. Step 2: Convert to fraction form
    717,398.85/990,055.18 = 395,108.86/x
  3. Step 3: Cross multiply
    717,398.85x = 990,055.18 × 395,108.86
  4. Step 4: Simplify right side
    717,398.85x = 391,179,573,506.90
  5. Step 5: Solve for x
    x = 391,179,573,506.90/717,398.85
  6. Step 6: Final answer
    x = 545,274.88

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Double scale
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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.