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Finding the Fourth Proportional to 48,639.40, 72,764.70 and 42,137.80

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Solution

The fourth proportional to 48,639.40, 72,764.70 and 42,137.80 is: 63,038.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,639.40 : 72,764.70 = 42,137.80 : x
  2. Step 2: Convert to fraction form
    48,639.40/72,764.70 = 42,137.80/x
  3. Step 3: Cross multiply
    48,639.40x = 72,764.70 × 42,137.80
  4. Step 4: Simplify right side
    48,639.40x = 3,066,144,375.66
  5. Step 5: Solve for x
    x = 3,066,144,375.66/48,639.40
  6. Step 6: Final answer
    x = 63,038.29

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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.