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Finding the Fourth Proportional to 913.68, 1,368.09 and 731.70

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Solution

The fourth proportional to 913.68, 1,368.09 and 731.70 is: 1,095.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.68 : 1,368.09 = 731.70 : x
  2. Step 2: Convert to fraction form
    913.68/1,368.09 = 731.70/x
  3. Step 3: Cross multiply
    913.68x = 1,368.09 × 731.70
  4. Step 4: Simplify right side
    913.68x = 1,001,031.45
  5. Step 5: Solve for x
    x = 1,001,031.45/913.68
  6. Step 6: Final answer
    x = 1,095.60

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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.