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Finding the Fourth Proportional to 1,275.39, 1,913.26 and 397.95

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Solution

The fourth proportional to 1,275.39, 1,913.26 and 397.95 is: 596.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.39 : 1,913.26 = 397.95 : x
  2. Step 2: Convert to fraction form
    1,275.39/1,913.26 = 397.95/x
  3. Step 3: Cross multiply
    1,275.39x = 1,913.26 × 397.95
  4. Step 4: Simplify right side
    1,275.39x = 761,379.83
  5. Step 5: Solve for x
    x = 761,379.83/1,275.39
  6. Step 6: Final answer
    x = 596.98

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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.