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Finding the Fourth Proportional to 872.15, 1,307.01 and 655.48

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Solution

The fourth proportional to 872.15, 1,307.01 and 655.48 is: 982.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.15 : 1,307.01 = 655.48 : x
  2. Step 2: Convert to fraction form
    872.15/1,307.01 = 655.48/x
  3. Step 3: Cross multiply
    872.15x = 1,307.01 × 655.48
  4. Step 4: Simplify right side
    872.15x = 856,712.38
  5. Step 5: Solve for x
    x = 856,712.38/872.15
  6. Step 6: Final answer
    x = 982.30

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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.