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Finding the Fourth Proportional to 975.15, 1,344.15 and 748.55

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Solution

The fourth proportional to 975.15, 1,344.15 and 748.55 is: 1,031.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.15 : 1,344.15 = 748.55 : x
  2. Step 2: Convert to fraction form
    975.15/1,344.15 = 748.55/x
  3. Step 3: Cross multiply
    975.15x = 1,344.15 × 748.55
  4. Step 4: Simplify right side
    975.15x = 1,006,156.76
  5. Step 5: Solve for x
    x = 1,006,156.76/975.15
  6. Step 6: Final answer
    x = 1,031.80

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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.