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Finding the Fourth Proportional to 1,281.91, 1,922.87 and 357.47

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Solution

The fourth proportional to 1,281.91, 1,922.87 and 357.47 is: 536.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.91 : 1,922.87 = 357.47 : x
  2. Step 2: Convert to fraction form
    1,281.91/1,922.87 = 357.47/x
  3. Step 3: Cross multiply
    1,281.91x = 1,922.87 × 357.47
  4. Step 4: Simplify right side
    1,281.91x = 687,373.15
  5. Step 5: Solve for x
    x = 687,373.15/1,281.91
  6. Step 6: Final answer
    x = 536.21

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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.