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Finding the Fourth Proportional to 520,098.30, 780,147.45 and 319,769.10

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Solution

The fourth proportional to 520,098.30, 780,147.45 and 319,769.10 is: 479,653.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,098.30 : 780,147.45 = 319,769.10 : x
  2. Step 2: Convert to fraction form
    520,098.30/780,147.45 = 319,769.10/x
  3. Step 3: Cross multiply
    520,098.30x = 780,147.45 × 319,769.10
  4. Step 4: Simplify right side
    520,098.30x = 249,467,047,953.80
  5. Step 5: Solve for x
    x = 249,467,047,953.80/520,098.30
  6. Step 6: Final answer
    x = 479,653.65

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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.