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Finding the Fourth Proportional to 1,248.48, 1,722.72 and 782.88

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Solution

The fourth proportional to 1,248.48, 1,722.72 and 782.88 is: 1,080.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.48 : 1,722.72 = 782.88 : x
  2. Step 2: Convert to fraction form
    1,248.48/1,722.72 = 782.88/x
  3. Step 3: Cross multiply
    1,248.48x = 1,722.72 × 782.88
  4. Step 4: Simplify right side
    1,248.48x = 1,348,683.03
  5. Step 5: Solve for x
    x = 1,348,683.03/1,248.48
  6. Step 6: Final answer
    x = 1,080.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.