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Finding the Fourth Proportional to 60,518.48, 90,780.16 and 21,079.58

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Solution

The fourth proportional to 60,518.48, 90,780.16 and 21,079.58 is: 31,620.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,518.48 : 90,780.16 = 21,079.58 : x
  2. Step 2: Convert to fraction form
    60,518.48/90,780.16 = 21,079.58/x
  3. Step 3: Cross multiply
    60,518.48x = 90,780.16 × 21,079.58
  4. Step 4: Simplify right side
    60,518.48x = 1,913,607,645.13
  5. Step 5: Solve for x
    x = 1,913,607,645.13/60,518.48
  6. Step 6: Final answer
    x = 31,620.22

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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.