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Finding the Fourth Proportional to 1,265.55, 1,897.20 and 680.87

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Solution

The fourth proportional to 1,265.55, 1,897.20 and 680.87 is: 1,020.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.55 : 1,897.20 = 680.87 : x
  2. Step 2: Convert to fraction form
    1,265.55/1,897.20 = 680.87/x
  3. Step 3: Cross multiply
    1,265.55x = 1,897.20 × 680.87
  4. Step 4: Simplify right side
    1,265.55x = 1,291,746.56
  5. Step 5: Solve for x
    x = 1,291,746.56/1,265.55
  6. Step 6: Final answer
    x = 1,020.70

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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.