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Finding the Fourth Proportional to 612,086.40, 918,129.60 and 257,500.80

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Solution

The fourth proportional to 612,086.40, 918,129.60 and 257,500.80 is: 386,251.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,086.40 : 918,129.60 = 257,500.80 : x
  2. Step 2: Convert to fraction form
    612,086.40/918,129.60 = 257,500.80/x
  3. Step 3: Cross multiply
    612,086.40x = 918,129.60 × 257,500.80
  4. Step 4: Simplify right side
    612,086.40x = 236,419,106,503.68
  5. Step 5: Solve for x
    x = 236,419,106,503.68/612,086.40
  6. Step 6: Final answer
    x = 386,251.20

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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.