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Finding the Fourth Proportional to 714.81, 991.45 and 685.65

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Solution

The fourth proportional to 714.81, 991.45 and 685.65 is: 951.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.81 : 991.45 = 685.65 : x
  2. Step 2: Convert to fraction form
    714.81/991.45 = 685.65/x
  3. Step 3: Cross multiply
    714.81x = 991.45 × 685.65
  4. Step 4: Simplify right side
    714.81x = 679,785.98
  5. Step 5: Solve for x
    x = 679,785.98/714.81
  6. Step 6: Final answer
    x = 951.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.