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Finding the Fourth Proportional to 1,277.85, 1,915.14 and 660.36

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Solution

The fourth proportional to 1,277.85, 1,915.14 and 660.36 is: 989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.85 : 1,915.14 = 660.36 : x
  2. Step 2: Convert to fraction form
    1,277.85/1,915.14 = 660.36/x
  3. Step 3: Cross multiply
    1,277.85x = 1,915.14 × 660.36
  4. Step 4: Simplify right side
    1,277.85x = 1,264,681.85
  5. Step 5: Solve for x
    x = 1,264,681.85/1,277.85
  6. Step 6: Final answer
    x = 989.70

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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.