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Finding the Fourth Proportional to 1,275.52, 1,912.72 and 397.78

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Solution

The fourth proportional to 1,275.52, 1,912.72 and 397.78 is: 596.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.52 : 1,912.72 = 397.78 : x
  2. Step 2: Convert to fraction form
    1,275.52/1,912.72 = 397.78/x
  3. Step 3: Cross multiply
    1,275.52x = 1,912.72 × 397.78
  4. Step 4: Simplify right side
    1,275.52x = 760,841.76
  5. Step 5: Solve for x
    x = 760,841.76/1,275.52
  6. Step 6: Final answer
    x = 596.50

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Double scale
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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.