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Finding the Fourth Proportional to 1,102.48, 1,655.25 and 690.42

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Solution

The fourth proportional to 1,102.48, 1,655.25 and 690.42 is: 1,036.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.48 : 1,655.25 = 690.42 : x
  2. Step 2: Convert to fraction form
    1,102.48/1,655.25 = 690.42/x
  3. Step 3: Cross multiply
    1,102.48x = 1,655.25 × 690.42
  4. Step 4: Simplify right side
    1,102.48x = 1,142,817.71
  5. Step 5: Solve for x
    x = 1,142,817.71/1,102.48
  6. Step 6: Final answer
    x = 1,036.59

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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.