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Finding the Fourth Proportional to 1,075.52, 1,613.28 and 712.61

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Solution

The fourth proportional to 1,075.52, 1,613.28 and 712.61 is: 1,068.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.52 : 1,613.28 = 712.61 : x
  2. Step 2: Convert to fraction form
    1,075.52/1,613.28 = 712.61/x
  3. Step 3: Cross multiply
    1,075.52x = 1,613.28 × 712.61
  4. Step 4: Simplify right side
    1,075.52x = 1,149,639.46
  5. Step 5: Solve for x
    x = 1,149,639.46/1,075.52
  6. Step 6: Final answer
    x = 1,068.92

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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.