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Finding the Fourth Proportional to 744.80, 1,118.40 and 540.80

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Solution

The fourth proportional to 744.80, 1,118.40 and 540.80 is: 812.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.80 : 1,118.40 = 540.80 : x
  2. Step 2: Convert to fraction form
    744.80/1,118.40 = 540.80/x
  3. Step 3: Cross multiply
    744.80x = 1,118.40 × 540.80
  4. Step 4: Simplify right side
    744.80x = 604,830.72
  5. Step 5: Solve for x
    x = 604,830.72/744.80
  6. Step 6: Final answer
    x = 812.07

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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.