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Finding the Fourth Proportional to 1,127.12, 1,554.03 and 916.70

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Solution

The fourth proportional to 1,127.12, 1,554.03 and 916.70 is: 1,263.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.12 : 1,554.03 = 916.70 : x
  2. Step 2: Convert to fraction form
    1,127.12/1,554.03 = 916.70/x
  3. Step 3: Cross multiply
    1,127.12x = 1,554.03 × 916.70
  4. Step 4: Simplify right side
    1,127.12x = 1,424,571.53
  5. Step 5: Solve for x
    x = 1,424,571.53/1,127.12
  6. Step 6: Final answer
    x = 1,263.91

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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.