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Finding the Fourth Proportional to 955.68, 1,319.28 and 624.12

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Solution

The fourth proportional to 955.68, 1,319.28 and 624.12 is: 861.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.68 : 1,319.28 = 624.12 : x
  2. Step 2: Convert to fraction form
    955.68/1,319.28 = 624.12/x
  3. Step 3: Cross multiply
    955.68x = 1,319.28 × 624.12
  4. Step 4: Simplify right side
    955.68x = 823,389.03
  5. Step 5: Solve for x
    x = 823,389.03/955.68
  6. Step 6: Final answer
    x = 861.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.