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Finding the Fourth Proportional to 1,143.60, 1,718.40 and 656.88

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Solution

The fourth proportional to 1,143.60, 1,718.40 and 656.88 is: 987.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.60 : 1,718.40 = 656.88 : x
  2. Step 2: Convert to fraction form
    1,143.60/1,718.40 = 656.88/x
  3. Step 3: Cross multiply
    1,143.60x = 1,718.40 × 656.88
  4. Step 4: Simplify right side
    1,143.60x = 1,128,782.59
  5. Step 5: Solve for x
    x = 1,128,782.59/1,143.60
  6. Step 6: Final answer
    x = 987.04

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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.