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Finding the Fourth Proportional to 515,421.80, 773,132.70 and 263,479.40

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Solution

The fourth proportional to 515,421.80, 773,132.70 and 263,479.40 is: 395,219.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,421.80 : 773,132.70 = 263,479.40 : x
  2. Step 2: Convert to fraction form
    515,421.80/773,132.70 = 263,479.40/x
  3. Step 3: Cross multiply
    515,421.80x = 773,132.70 × 263,479.40
  4. Step 4: Simplify right side
    515,421.80x = 203,704,539,916.38
  5. Step 5: Solve for x
    x = 203,704,539,916.38/515,421.80
  6. Step 6: Final answer
    x = 395,219.10

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Double scale
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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.