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Finding the Fourth Proportional to 744.70, 1,117.20 and 623.80

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Solution

The fourth proportional to 744.70, 1,117.20 and 623.80 is: 935.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.70 : 1,117.20 = 623.80 : x
  2. Step 2: Convert to fraction form
    744.70/1,117.20 = 623.80/x
  3. Step 3: Cross multiply
    744.70x = 1,117.20 × 623.80
  4. Step 4: Simplify right side
    744.70x = 696,909.36
  5. Step 5: Solve for x
    x = 696,909.36/744.70
  6. Step 6: Final answer
    x = 935.83

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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.