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Finding the Fourth Proportional to 938.90, 1,317.70 and 938.90

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Solution

The fourth proportional to 938.90, 1,317.70 and 938.90 is: 1,317.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.90 : 1,317.70 = 938.90 : x
  2. Step 2: Convert to fraction form
    938.90/1,317.70 = 938.90/x
  3. Step 3: Cross multiply
    938.90x = 1,317.70 × 938.90
  4. Step 4: Simplify right side
    938.90x = 1,237,188.53
  5. Step 5: Solve for x
    x = 1,237,188.53/938.90
  6. Step 6: Final answer
    x = 1,317.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.