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Finding the Fourth Proportional to 38,430.60, 57,645.90 and 20,715.90

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Solution

The fourth proportional to 38,430.60, 57,645.90 and 20,715.90 is: 31,073.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,430.60 : 57,645.90 = 20,715.90 : x
  2. Step 2: Convert to fraction form
    38,430.60/57,645.90 = 20,715.90/x
  3. Step 3: Cross multiply
    38,430.60x = 57,645.90 × 20,715.90
  4. Step 4: Simplify right side
    38,430.60x = 1,194,186,699.81
  5. Step 5: Solve for x
    x = 1,194,186,699.81/38,430.60
  6. Step 6: Final answer
    x = 31,073.85

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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.