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Finding the Fourth Proportional to 1,326.42, 1,987.91 and 545.53

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Solution

The fourth proportional to 1,326.42, 1,987.91 and 545.53 is: 817.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.42 : 1,987.91 = 545.53 : x
  2. Step 2: Convert to fraction form
    1,326.42/1,987.91 = 545.53/x
  3. Step 3: Cross multiply
    1,326.42x = 1,987.91 × 545.53
  4. Step 4: Simplify right side
    1,326.42x = 1,084,464.54
  5. Step 5: Solve for x
    x = 1,084,464.54/1,326.42
  6. Step 6: Final answer
    x = 817.59

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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.