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Finding the Fourth Proportional to 872.48, 1,307.28 and 628.64

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Solution

The fourth proportional to 872.48, 1,307.28 and 628.64 is: 941.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.48 : 1,307.28 = 628.64 : x
  2. Step 2: Convert to fraction form
    872.48/1,307.28 = 628.64/x
  3. Step 3: Cross multiply
    872.48x = 1,307.28 × 628.64
  4. Step 4: Simplify right side
    872.48x = 821,808.50
  5. Step 5: Solve for x
    x = 821,808.50/872.48
  6. Step 6: Final answer
    x = 941.92

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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.