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Finding the Fourth Proportional to 916.90, 1,375.45 and 688.68

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Solution

The fourth proportional to 916.90, 1,375.45 and 688.68 is: 1,033.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.90 : 1,375.45 = 688.68 : x
  2. Step 2: Convert to fraction form
    916.90/1,375.45 = 688.68/x
  3. Step 3: Cross multiply
    916.90x = 1,375.45 × 688.68
  4. Step 4: Simplify right side
    916.90x = 947,243.18
  5. Step 5: Solve for x
    x = 947,243.18/916.90
  6. Step 6: Final answer
    x = 1,033.10

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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.