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Finding the Fourth Proportional to 1,123.90, 1,684.50 and 539.08

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Solution

The fourth proportional to 1,123.90, 1,684.50 and 539.08 is: 807.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.90 : 1,684.50 = 539.08 : x
  2. Step 2: Convert to fraction form
    1,123.90/1,684.50 = 539.08/x
  3. Step 3: Cross multiply
    1,123.90x = 1,684.50 × 539.08
  4. Step 4: Simplify right side
    1,123.90x = 908,080.26
  5. Step 5: Solve for x
    x = 908,080.26/1,123.90
  6. Step 6: Final answer
    x = 807.97

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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.