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Finding the Fourth Proportional to 21,145.59, 31,718.39 and 7,294.59

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Solution

The fourth proportional to 21,145.59, 31,718.39 and 7,294.59 is: 10,941.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,145.59 : 31,718.39 = 7,294.59 : x
  2. Step 2: Convert to fraction form
    21,145.59/31,718.39 = 7,294.59/x
  3. Step 3: Cross multiply
    21,145.59x = 31,718.39 × 7,294.59
  4. Step 4: Simplify right side
    21,145.59x = 231,372,614.04
  5. Step 5: Solve for x
    x = 231,372,614.04/21,145.59
  6. Step 6: Final answer
    x = 10,941.89

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1.5x scale

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.