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Finding the Fourth Proportional to 956.90, 1,319.84 and 878.45

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Solution

The fourth proportional to 956.90, 1,319.84 and 878.45 is: 1,211.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.90 : 1,319.84 = 878.45 : x
  2. Step 2: Convert to fraction form
    956.90/1,319.84 = 878.45/x
  3. Step 3: Cross multiply
    956.90x = 1,319.84 × 878.45
  4. Step 4: Simplify right side
    956.90x = 1,159,402.46
  5. Step 5: Solve for x
    x = 1,159,402.46/956.90
  6. Step 6: Final answer
    x = 1,211.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.