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Finding the Fourth Proportional to 1,242.16, 1,862.88 and 511.60

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Solution

The fourth proportional to 1,242.16, 1,862.88 and 511.60 is: 767.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.16 : 1,862.88 = 511.60 : x
  2. Step 2: Convert to fraction form
    1,242.16/1,862.88 = 511.60/x
  3. Step 3: Cross multiply
    1,242.16x = 1,862.88 × 511.60
  4. Step 4: Simplify right side
    1,242.16x = 953,049.41
  5. Step 5: Solve for x
    x = 953,049.41/1,242.16
  6. Step 6: Final answer
    x = 767.25

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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.