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Finding the Fourth Proportional to 931.26, 1,397.56 and 623.70

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Solution

The fourth proportional to 931.26, 1,397.56 and 623.70 is: 936.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.26 : 1,397.56 = 623.70 : x
  2. Step 2: Convert to fraction form
    931.26/1,397.56 = 623.70/x
  3. Step 3: Cross multiply
    931.26x = 1,397.56 × 623.70
  4. Step 4: Simplify right side
    931.26x = 871,658.17
  5. Step 5: Solve for x
    x = 871,658.17/931.26
  6. Step 6: Final answer
    x = 936.00

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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.