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Finding the Fourth Proportional to 885.98, 1,329.37 and 871.40

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Solution

The fourth proportional to 885.98, 1,329.37 and 871.40 is: 1,307.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.98 : 1,329.37 = 871.40 : x
  2. Step 2: Convert to fraction form
    885.98/1,329.37 = 871.40/x
  3. Step 3: Cross multiply
    885.98x = 1,329.37 × 871.40
  4. Step 4: Simplify right side
    885.98x = 1,158,413.02
  5. Step 5: Solve for x
    x = 1,158,413.02/885.98
  6. Step 6: Final answer
    x = 1,307.49

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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.