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Finding the Fourth Proportional to 916.88, 1,375.68 and 841.28

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Solution

The fourth proportional to 916.88, 1,375.68 and 841.28 is: 1,262.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.88 : 1,375.68 = 841.28 : x
  2. Step 2: Convert to fraction form
    916.88/1,375.68 = 841.28/x
  3. Step 3: Cross multiply
    916.88x = 1,375.68 × 841.28
  4. Step 4: Simplify right side
    916.88x = 1,157,332.07
  5. Step 5: Solve for x
    x = 1,157,332.07/916.88
  6. Step 6: Final answer
    x = 1,262.25

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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.