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Finding the Fourth Proportional to 78,698.61, 108,600.91 and 42,887.86

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Solution

The fourth proportional to 78,698.61, 108,600.91 and 42,887.86 is: 59,183.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,698.61 : 108,600.91 = 42,887.86 : x
  2. Step 2: Convert to fraction form
    78,698.61/108,600.91 = 42,887.86/x
  3. Step 3: Cross multiply
    78,698.61x = 108,600.91 × 42,887.86
  4. Step 4: Simplify right side
    78,698.61x = 4,657,660,623.95
  5. Step 5: Solve for x
    x = 4,657,660,623.95/78,698.61
  6. Step 6: Final answer
    x = 59,183.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.