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Finding the Fourth Proportional to 713.40, 987.78 and 676.95

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Solution

The fourth proportional to 713.40, 987.78 and 676.95 is: 937.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.40 : 987.78 = 676.95 : x
  2. Step 2: Convert to fraction form
    713.40/987.78 = 676.95/x
  3. Step 3: Cross multiply
    713.40x = 987.78 × 676.95
  4. Step 4: Simplify right side
    713.40x = 668,677.67
  5. Step 5: Solve for x
    x = 668,677.67/713.40
  6. Step 6: Final answer
    x = 937.31

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1.5x scale

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.