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Finding the Fourth Proportional to 38,639.40, 54,211.80 and 38,639.40

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Solution

The fourth proportional to 38,639.40, 54,211.80 and 38,639.40 is: 54,211.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,639.40 : 54,211.80 = 38,639.40 : x
  2. Step 2: Convert to fraction form
    38,639.40/54,211.80 = 38,639.40/x
  3. Step 3: Cross multiply
    38,639.40x = 54,211.80 × 38,639.40
  4. Step 4: Simplify right side
    38,639.40x = 2,094,711,424.92
  5. Step 5: Solve for x
    x = 2,094,711,424.92/38,639.40
  6. Step 6: Final answer
    x = 54,211.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.