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Finding the Fourth Proportional to 1,020.57, 1,528.43 and 557.66

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Solution

The fourth proportional to 1,020.57, 1,528.43 and 557.66 is: 835.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.57 : 1,528.43 = 557.66 : x
  2. Step 2: Convert to fraction form
    1,020.57/1,528.43 = 557.66/x
  3. Step 3: Cross multiply
    1,020.57x = 1,528.43 × 557.66
  4. Step 4: Simplify right side
    1,020.57x = 852,333.84
  5. Step 5: Solve for x
    x = 852,333.84/1,020.57
  6. Step 6: Final answer
    x = 835.15

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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.