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Finding the Fourth Proportional to 1,020.80, 1,529.52 and 587.20

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Solution

The fourth proportional to 1,020.80, 1,529.52 and 587.20 is: 879.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.80 : 1,529.52 = 587.20 : x
  2. Step 2: Convert to fraction form
    1,020.80/1,529.52 = 587.20/x
  3. Step 3: Cross multiply
    1,020.80x = 1,529.52 × 587.20
  4. Step 4: Simplify right side
    1,020.80x = 898,134.14
  5. Step 5: Solve for x
    x = 898,134.14/1,020.80
  6. Step 6: Final answer
    x = 879.83

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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.