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Finding the Fourth Proportional to 1,187.92, 1,782.48 and 639.52

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Solution

The fourth proportional to 1,187.92, 1,782.48 and 639.52 is: 959.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.92 : 1,782.48 = 639.52 : x
  2. Step 2: Convert to fraction form
    1,187.92/1,782.48 = 639.52/x
  3. Step 3: Cross multiply
    1,187.92x = 1,782.48 × 639.52
  4. Step 4: Simplify right side
    1,187.92x = 1,139,931.61
  5. Step 5: Solve for x
    x = 1,139,931.61/1,187.92
  6. Step 6: Final answer
    x = 959.60

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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.