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Finding the Fourth Proportional to 1,275.24, 1,912.98 and 495.20

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Solution

The fourth proportional to 1,275.24, 1,912.98 and 495.20 is: 742.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.24 : 1,912.98 = 495.20 : x
  2. Step 2: Convert to fraction form
    1,275.24/1,912.98 = 495.20/x
  3. Step 3: Cross multiply
    1,275.24x = 1,912.98 × 495.20
  4. Step 4: Simplify right side
    1,275.24x = 947,307.70
  5. Step 5: Solve for x
    x = 947,307.70/1,275.24
  6. Step 6: Final answer
    x = 742.85

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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.