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Finding the Fourth Proportional to 20,991.66, 31,487.48 and 7,140.66

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Solution

The fourth proportional to 20,991.66, 31,487.48 and 7,140.66 is: 10,710.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.66 : 31,487.48 = 7,140.66 : x
  2. Step 2: Convert to fraction form
    20,991.66/31,487.48 = 7,140.66/x
  3. Step 3: Cross multiply
    20,991.66x = 31,487.48 × 7,140.66
  4. Step 4: Simplify right side
    20,991.66x = 224,841,302.10
  5. Step 5: Solve for x
    x = 224,841,302.10/20,991.66
  6. Step 6: Final answer
    x = 10,710.98

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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.