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Finding the Fourth Proportional to 879.12, 1,319.13 and 637.64

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Solution

The fourth proportional to 879.12, 1,319.13 and 637.64 is: 956.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.12 : 1,319.13 = 637.64 : x
  2. Step 2: Convert to fraction form
    879.12/1,319.13 = 637.64/x
  3. Step 3: Cross multiply
    879.12x = 1,319.13 × 637.64
  4. Step 4: Simplify right side
    879.12x = 841,128.40
  5. Step 5: Solve for x
    x = 841,128.40/879.12
  6. Step 6: Final answer
    x = 956.78

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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.