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Finding the Fourth Proportional to 48,490.60, 72,721.02 and 13,421.80

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Solution

The fourth proportional to 48,490.60, 72,721.02 and 13,421.80 is: 20,128.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,490.60 : 72,721.02 = 13,421.80 : x
  2. Step 2: Convert to fraction form
    48,490.60/72,721.02 = 13,421.80/x
  3. Step 3: Cross multiply
    48,490.60x = 72,721.02 × 13,421.80
  4. Step 4: Simplify right side
    48,490.60x = 976,046,986.24
  5. Step 5: Solve for x
    x = 976,046,986.24/48,490.60
  6. Step 6: Final answer
    x = 20,128.58

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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.