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Finding the Fourth Proportional to 1,612.80, 2,419.20 and 572.76

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Solution

The fourth proportional to 1,612.80, 2,419.20 and 572.76 is: 859.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,612.80 : 2,419.20 = 572.76 : x
  2. Step 2: Convert to fraction form
    1,612.80/2,419.20 = 572.76/x
  3. Step 3: Cross multiply
    1,612.80x = 2,419.20 × 572.76
  4. Step 4: Simplify right side
    1,612.80x = 1,385,620.99
  5. Step 5: Solve for x
    x = 1,385,620.99/1,612.80
  6. Step 6: Final answer
    x = 859.14

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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.