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Finding the Fourth Proportional to 66,478.40, 91,742.24 and 38,189.76

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Solution

The fourth proportional to 66,478.40, 91,742.24 and 38,189.76 is: 52,703.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,478.40 : 91,742.24 = 38,189.76 : x
  2. Step 2: Convert to fraction form
    66,478.40/91,742.24 = 38,189.76/x
  3. Step 3: Cross multiply
    66,478.40x = 91,742.24 × 38,189.76
  4. Step 4: Simplify right side
    66,478.40x = 3,503,614,127.46
  5. Step 5: Solve for x
    x = 3,503,614,127.46/66,478.40
  6. Step 6: Final answer
    x = 52,703.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.