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Finding the Fourth Proportional to 1,276.48, 1,915.20 and 912.64

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Solution

The fourth proportional to 1,276.48, 1,915.20 and 912.64 is: 1,369.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.48 : 1,915.20 = 912.64 : x
  2. Step 2: Convert to fraction form
    1,276.48/1,915.20 = 912.64/x
  3. Step 3: Cross multiply
    1,276.48x = 1,915.20 × 912.64
  4. Step 4: Simplify right side
    1,276.48x = 1,747,888.13
  5. Step 5: Solve for x
    x = 1,747,888.13/1,276.48
  6. Step 6: Final answer
    x = 1,369.30

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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.