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Finding the Fourth Proportional to 741.60, 1,022.40 and 624.96

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Solution

The fourth proportional to 741.60, 1,022.40 and 624.96 is: 861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.60 : 1,022.40 = 624.96 : x
  2. Step 2: Convert to fraction form
    741.60/1,022.40 = 624.96/x
  3. Step 3: Cross multiply
    741.60x = 1,022.40 × 624.96
  4. Step 4: Simplify right side
    741.60x = 638,959.10
  5. Step 5: Solve for x
    x = 638,959.10/741.60
  6. Step 6: Final answer
    x = 861.60

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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.