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Finding the Fourth Proportional to 1,126.58, 1,687.55 and 577.98

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Solution

The fourth proportional to 1,126.58, 1,687.55 and 577.98 is: 865.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.58 : 1,687.55 = 577.98 : x
  2. Step 2: Convert to fraction form
    1,126.58/1,687.55 = 577.98/x
  3. Step 3: Cross multiply
    1,126.58x = 1,687.55 × 577.98
  4. Step 4: Simplify right side
    1,126.58x = 975,367.26
  5. Step 5: Solve for x
    x = 975,367.26/1,126.58
  6. Step 6: Final answer
    x = 865.78

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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.