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Finding the Fourth Proportional to 39,978.88, 59,968.32 and 12,276.88

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Solution

The fourth proportional to 39,978.88, 59,968.32 and 12,276.88 is: 18,415.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.88 : 59,968.32 = 12,276.88 : x
  2. Step 2: Convert to fraction form
    39,978.88/59,968.32 = 12,276.88/x
  3. Step 3: Cross multiply
    39,978.88x = 59,968.32 × 12,276.88
  4. Step 4: Simplify right side
    39,978.88x = 736,223,868.44
  5. Step 5: Solve for x
    x = 736,223,868.44/39,978.88
  6. Step 6: Final answer
    x = 18,415.32

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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.