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Finding the Fourth Proportional to 671.88, 929.86 and 655.72

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Solution

The fourth proportional to 671.88, 929.86 and 655.72 is: 907.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.88 : 929.86 = 655.72 : x
  2. Step 2: Convert to fraction form
    671.88/929.86 = 655.72/x
  3. Step 3: Cross multiply
    671.88x = 929.86 × 655.72
  4. Step 4: Simplify right side
    671.88x = 609,727.80
  5. Step 5: Solve for x
    x = 609,727.80/671.88
  6. Step 6: Final answer
    x = 907.50

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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.