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Finding the Fourth Proportional to 788.78, 1,087.02 and 567.34

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Solution

The fourth proportional to 788.78, 1,087.02 and 567.34 is: 781.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.78 : 1,087.02 = 567.34 : x
  2. Step 2: Convert to fraction form
    788.78/1,087.02 = 567.34/x
  3. Step 3: Cross multiply
    788.78x = 1,087.02 × 567.34
  4. Step 4: Simplify right side
    788.78x = 616,707.21
  5. Step 5: Solve for x
    x = 616,707.21/788.78
  6. Step 6: Final answer
    x = 781.85

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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.