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Finding the Fourth Proportional to 1,125.52, 1,688.28 and 740.68

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Solution

The fourth proportional to 1,125.52, 1,688.28 and 740.68 is: 1,111.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.52 : 1,688.28 = 740.68 : x
  2. Step 2: Convert to fraction form
    1,125.52/1,688.28 = 740.68/x
  3. Step 3: Cross multiply
    1,125.52x = 1,688.28 × 740.68
  4. Step 4: Simplify right side
    1,125.52x = 1,250,475.23
  5. Step 5: Solve for x
    x = 1,250,475.23/1,125.52
  6. Step 6: Final answer
    x = 1,111.02

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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.