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Finding the Fourth Proportional to 711.90, 1,067.18 and 653.50

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Solution

The fourth proportional to 711.90, 1,067.18 and 653.50 is: 979.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.90 : 1,067.18 = 653.50 : x
  2. Step 2: Convert to fraction form
    711.90/1,067.18 = 653.50/x
  3. Step 3: Cross multiply
    711.90x = 1,067.18 × 653.50
  4. Step 4: Simplify right side
    711.90x = 697,402.13
  5. Step 5: Solve for x
    x = 697,402.13/711.90
  6. Step 6: Final answer
    x = 979.63

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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.