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Finding the Fourth Proportional to 1,011.52, 1,516 and 686.08

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Solution

The fourth proportional to 1,011.52, 1,516 and 686.08 is: 1,028.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.52 : 1,516 = 686.08 : x
  2. Step 2: Convert to fraction form
    1,011.52/1,516 = 686.08/x
  3. Step 3: Cross multiply
    1,011.52x = 1,516 × 686.08
  4. Step 4: Simplify right side
    1,011.52x = 1,040,097.28
  5. Step 5: Solve for x
    x = 1,040,097.28/1,011.52
  6. Step 6: Final answer
    x = 1,028.25

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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.