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Finding the Fourth Proportional to 690.61, 1,035.92 and 177.61

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Solution

The fourth proportional to 690.61, 1,035.92 and 177.61 is: 266.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.61 : 1,035.92 = 177.61 : x
  2. Step 2: Convert to fraction form
    690.61/1,035.92 = 177.61/x
  3. Step 3: Cross multiply
    690.61x = 1,035.92 × 177.61
  4. Step 4: Simplify right side
    690.61x = 183,988.55
  5. Step 5: Solve for x
    x = 183,988.55/690.61
  6. Step 6: Final answer
    x = 266.41

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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.