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Finding the Fourth Proportional to 780.12, 1,073.88 and 667.44

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Solution

The fourth proportional to 780.12, 1,073.88 and 667.44 is: 918.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.12 : 1,073.88 = 667.44 : x
  2. Step 2: Convert to fraction form
    780.12/1,073.88 = 667.44/x
  3. Step 3: Cross multiply
    780.12x = 1,073.88 × 667.44
  4. Step 4: Simplify right side
    780.12x = 716,750.47
  5. Step 5: Solve for x
    x = 716,750.47/780.12
  6. Step 6: Final answer
    x = 918.77

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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.