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Finding the Fourth Proportional to 257,066.80, 385,657.80 and 99,281.20

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Solution

The fourth proportional to 257,066.80, 385,657.80 and 99,281.20 is: 148,944.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,066.80 : 385,657.80 = 99,281.20 : x
  2. Step 2: Convert to fraction form
    257,066.80/385,657.80 = 99,281.20/x
  3. Step 3: Cross multiply
    257,066.80x = 385,657.80 × 99,281.20
  4. Step 4: Simplify right side
    257,066.80x = 38,288,569,173.36
  5. Step 5: Solve for x
    x = 38,288,569,173.36/257,066.80
  6. Step 6: Final answer
    x = 148,944.05

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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.