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Finding the Fourth Proportional to 886.50, 1,330.07 and 642.60

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Solution

The fourth proportional to 886.50, 1,330.07 and 642.60 is: 964.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.50 : 1,330.07 = 642.60 : x
  2. Step 2: Convert to fraction form
    886.50/1,330.07 = 642.60/x
  3. Step 3: Cross multiply
    886.50x = 1,330.07 × 642.60
  4. Step 4: Simplify right side
    886.50x = 854,699.77
  5. Step 5: Solve for x
    x = 854,699.77/886.50
  6. Step 6: Final answer
    x = 964.13

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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.