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Finding the Fourth Proportional to 21,000.70, 31,501.05 and 20,287.90

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Solution

The fourth proportional to 21,000.70, 31,501.05 and 20,287.90 is: 30,431.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.70 : 31,501.05 = 20,287.90 : x
  2. Step 2: Convert to fraction form
    21,000.70/31,501.05 = 20,287.90/x
  3. Step 3: Cross multiply
    21,000.70x = 31,501.05 × 20,287.90
  4. Step 4: Simplify right side
    21,000.70x = 639,090,152.30
  5. Step 5: Solve for x
    x = 639,090,152.30/21,000.70
  6. Step 6: Final answer
    x = 30,431.85

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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.