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Finding the Fourth Proportional to 1,306.77, 1,954.68 and 916.75

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Solution

The fourth proportional to 1,306.77, 1,954.68 and 916.75 is: 1,371.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.77 : 1,954.68 = 916.75 : x
  2. Step 2: Convert to fraction form
    1,306.77/1,954.68 = 916.75/x
  3. Step 3: Cross multiply
    1,306.77x = 1,954.68 × 916.75
  4. Step 4: Simplify right side
    1,306.77x = 1,791,952.89
  5. Step 5: Solve for x
    x = 1,791,952.89/1,306.77
  6. Step 6: Final answer
    x = 1,371.28

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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.