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Finding the Fourth Proportional to 1,306.16, 1,802.42 and 781.88

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Solution

The fourth proportional to 1,306.16, 1,802.42 and 781.88 is: 1,078.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.16 : 1,802.42 = 781.88 : x
  2. Step 2: Convert to fraction form
    1,306.16/1,802.42 = 781.88/x
  3. Step 3: Cross multiply
    1,306.16x = 1,802.42 × 781.88
  4. Step 4: Simplify right side
    1,306.16x = 1,409,276.15
  5. Step 5: Solve for x
    x = 1,409,276.15/1,306.16
  6. Step 6: Final answer
    x = 1,078.95

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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.