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Finding the Fourth Proportional to 1,123.95, 1,685.93 and 577.20

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Solution

The fourth proportional to 1,123.95, 1,685.93 and 577.20 is: 865.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.95 : 1,685.93 = 577.20 : x
  2. Step 2: Convert to fraction form
    1,123.95/1,685.93 = 577.20/x
  3. Step 3: Cross multiply
    1,123.95x = 1,685.93 × 577.20
  4. Step 4: Simplify right side
    1,123.95x = 973,115.91
  5. Step 5: Solve for x
    x = 973,115.91/1,123.95
  6. Step 6: Final answer
    x = 865.80

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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.