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Finding the Fourth Proportional to 879.16, 1,315.80 and 631.72

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Solution

The fourth proportional to 879.16, 1,315.80 and 631.72 is: 945.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.16 : 1,315.80 = 631.72 : x
  2. Step 2: Convert to fraction form
    879.16/1,315.80 = 631.72/x
  3. Step 3: Cross multiply
    879.16x = 1,315.80 × 631.72
  4. Step 4: Simplify right side
    879.16x = 831,217.18
  5. Step 5: Solve for x
    x = 831,217.18/879.16
  6. Step 6: Final answer
    x = 945.47

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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.