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Finding the Fourth Proportional to 1,011.17, 1,516.54 and 280.55

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Solution

The fourth proportional to 1,011.17, 1,516.54 and 280.55 is: 420.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.17 : 1,516.54 = 280.55 : x
  2. Step 2: Convert to fraction form
    1,011.17/1,516.54 = 280.55/x
  3. Step 3: Cross multiply
    1,011.17x = 1,516.54 × 280.55
  4. Step 4: Simplify right side
    1,011.17x = 425,465.30
  5. Step 5: Solve for x
    x = 425,465.30/1,011.17
  6. Step 6: Final answer
    x = 420.77

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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.