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Finding the Fourth Proportional to 60,428.80, 90,643.20 and 47,987.20

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Solution

The fourth proportional to 60,428.80, 90,643.20 and 47,987.20 is: 71,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,428.80 : 90,643.20 = 47,987.20 : x
  2. Step 2: Convert to fraction form
    60,428.80/90,643.20 = 47,987.20/x
  3. Step 3: Cross multiply
    60,428.80x = 90,643.20 × 47,987.20
  4. Step 4: Simplify right side
    60,428.80x = 4,349,713,367.04
  5. Step 5: Solve for x
    x = 4,349,713,367.04/60,428.80
  6. Step 6: Final answer
    x = 71,980.80

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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.