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Finding the Fourth Proportional to 886.15, 1,327.60 and 642.07

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Solution

The fourth proportional to 886.15, 1,327.60 and 642.07 is: 961.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.15 : 1,327.60 = 642.07 : x
  2. Step 2: Convert to fraction form
    886.15/1,327.60 = 642.07/x
  3. Step 3: Cross multiply
    886.15x = 1,327.60 × 642.07
  4. Step 4: Simplify right side
    886.15x = 852,412.13
  5. Step 5: Solve for x
    x = 852,412.13/886.15
  6. Step 6: Final answer
    x = 961.93

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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.