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Finding the Fourth Proportional to 711.06, 981.40 and 679.93

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Solution

The fourth proportional to 711.06, 981.40 and 679.93 is: 938.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.06 : 981.40 = 679.93 : x
  2. Step 2: Convert to fraction form
    711.06/981.40 = 679.93/x
  3. Step 3: Cross multiply
    711.06x = 981.40 × 679.93
  4. Step 4: Simplify right side
    711.06x = 667,283.30
  5. Step 5: Solve for x
    x = 667,283.30/711.06
  6. Step 6: Final answer
    x = 938.43

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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.