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Finding the Fourth Proportional to 520,098.80, 780,148.20 and 319,769.60

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Solution

The fourth proportional to 520,098.80, 780,148.20 and 319,769.60 is: 479,654.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,098.80 : 780,148.20 = 319,769.60 : x
  2. Step 2: Convert to fraction form
    520,098.80/780,148.20 = 319,769.60/x
  3. Step 3: Cross multiply
    520,098.80x = 780,148.20 × 319,769.60
  4. Step 4: Simplify right side
    520,098.80x = 249,467,677,854.72
  5. Step 5: Solve for x
    x = 249,467,677,854.72/520,098.80
  6. Step 6: Final answer
    x = 479,654.40

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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.