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Finding the Fourth Proportional to 1,275.79, 1,913.11 and 495.20

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Solution

The fourth proportional to 1,275.79, 1,913.11 and 495.20 is: 742.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.79 : 1,913.11 = 495.20 : x
  2. Step 2: Convert to fraction form
    1,275.79/1,913.11 = 495.20/x
  3. Step 3: Cross multiply
    1,275.79x = 1,913.11 × 495.20
  4. Step 4: Simplify right side
    1,275.79x = 947,372.23
  5. Step 5: Solve for x
    x = 947,372.23/1,275.79
  6. Step 6: Final answer
    x = 742.58

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1.5x scale

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.