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Finding the Fourth Proportional to 843.10, 1,263.30 and 624.40

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Solution

The fourth proportional to 843.10, 1,263.30 and 624.40 is: 935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.10 : 1,263.30 = 624.40 : x
  2. Step 2: Convert to fraction form
    843.10/1,263.30 = 624.40/x
  3. Step 3: Cross multiply
    843.10x = 1,263.30 × 624.40
  4. Step 4: Simplify right side
    843.10x = 788,804.52
  5. Step 5: Solve for x
    x = 788,804.52/843.10
  6. Step 6: Final answer
    x = 935.60

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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.