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Finding the Fourth Proportional to 879.98, 1,316.82 and 648.32

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Solution

The fourth proportional to 879.98, 1,316.82 and 648.32 is: 970.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.98 : 1,316.82 = 648.32 : x
  2. Step 2: Convert to fraction form
    879.98/1,316.82 = 648.32/x
  3. Step 3: Cross multiply
    879.98x = 1,316.82 × 648.32
  4. Step 4: Simplify right side
    879.98x = 853,720.74
  5. Step 5: Solve for x
    x = 853,720.74/879.98
  6. Step 6: Final answer
    x = 970.16

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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.