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Finding the Fourth Proportional to 977.69, 1,462.15 and 868.68

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Solution

The fourth proportional to 977.69, 1,462.15 and 868.68 is: 1,299.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.69 : 1,462.15 = 868.68 : x
  2. Step 2: Convert to fraction form
    977.69/1,462.15 = 868.68/x
  3. Step 3: Cross multiply
    977.69x = 1,462.15 × 868.68
  4. Step 4: Simplify right side
    977.69x = 1,270,140.46
  5. Step 5: Solve for x
    x = 1,270,140.46/977.69
  6. Step 6: Final answer
    x = 1,299.12

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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.