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Finding the Fourth Proportional to 1,276.42, 1,915.65 and 660.31

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Solution

The fourth proportional to 1,276.42, 1,915.65 and 660.31 is: 990.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.42 : 1,915.65 = 660.31 : x
  2. Step 2: Convert to fraction form
    1,276.42/1,915.65 = 660.31/x
  3. Step 3: Cross multiply
    1,276.42x = 1,915.65 × 660.31
  4. Step 4: Simplify right side
    1,276.42x = 1,264,913.27
  5. Step 5: Solve for x
    x = 1,264,913.27/1,276.42
  6. Step 6: Final answer
    x = 990.99

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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.