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Finding the Fourth Proportional to 611,380.60, 917,070.90 and 387,431.80

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Solution

The fourth proportional to 611,380.60, 917,070.90 and 387,431.80 is: 581,147.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,380.60 : 917,070.90 = 387,431.80 : x
  2. Step 2: Convert to fraction form
    611,380.60/917,070.90 = 387,431.80/x
  3. Step 3: Cross multiply
    611,380.60x = 917,070.90 × 387,431.80
  4. Step 4: Simplify right side
    611,380.60x = 355,302,429,514.62
  5. Step 5: Solve for x
    x = 355,302,429,514.62/611,380.60
  6. Step 6: Final answer
    x = 581,147.70

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.