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Finding the Fourth Proportional to 1,125.51, 1,688.36 and 476.43

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Solution

The fourth proportional to 1,125.51, 1,688.36 and 476.43 is: 714.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.51 : 1,688.36 = 476.43 : x
  2. Step 2: Convert to fraction form
    1,125.51/1,688.36 = 476.43/x
  3. Step 3: Cross multiply
    1,125.51x = 1,688.36 × 476.43
  4. Step 4: Simplify right side
    1,125.51x = 804,382.97
  5. Step 5: Solve for x
    x = 804,382.97/1,125.51
  6. Step 6: Final answer
    x = 714.68

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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.