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Finding the Fourth Proportional to 1,125.45, 1,687.16 and 577.35

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Solution

The fourth proportional to 1,125.45, 1,687.16 and 577.35 is: 865.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.45 : 1,687.16 = 577.35 : x
  2. Step 2: Convert to fraction form
    1,125.45/1,687.16 = 577.35/x
  3. Step 3: Cross multiply
    1,125.45x = 1,687.16 × 577.35
  4. Step 4: Simplify right side
    1,125.45x = 974,078.94
  5. Step 5: Solve for x
    x = 974,078.94/1,125.45
  6. Step 6: Final answer
    x = 865.50

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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.