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Finding the Fourth Proportional to 60,981.20, 91,478.52 and 19,418.64

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Solution

The fourth proportional to 60,981.20, 91,478.52 and 19,418.64 is: 29,130.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,981.20 : 91,478.52 = 19,418.64 : x
  2. Step 2: Convert to fraction form
    60,981.20/91,478.52 = 19,418.64/x
  3. Step 3: Cross multiply
    60,981.20x = 91,478.52 × 19,418.64
  4. Step 4: Simplify right side
    60,981.20x = 1,776,388,447.61
  5. Step 5: Solve for x
    x = 1,776,388,447.61/60,981.20
  6. Step 6: Final answer
    x = 29,130.10

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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.