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Finding the Fourth Proportional to 872.40, 1,307.60 and 655.28

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Solution

The fourth proportional to 872.40, 1,307.60 and 655.28 is: 982.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.40 : 1,307.60 = 655.28 : x
  2. Step 2: Convert to fraction form
    872.40/1,307.60 = 655.28/x
  3. Step 3: Cross multiply
    872.40x = 1,307.60 × 655.28
  4. Step 4: Simplify right side
    872.40x = 856,844.13
  5. Step 5: Solve for x
    x = 856,844.13/872.40
  6. Step 6: Final answer
    x = 982.17

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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.