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Finding the Fourth Proportional to 118,385.61, 163,247.88 and 78,047.76

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Solution

The fourth proportional to 118,385.61, 163,247.88 and 78,047.76 is: 107,623.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,385.61 : 163,247.88 = 78,047.76 : x
  2. Step 2: Convert to fraction form
    118,385.61/163,247.88 = 78,047.76/x
  3. Step 3: Cross multiply
    118,385.61x = 163,247.88 × 78,047.76
  4. Step 4: Simplify right side
    118,385.61x = 12,741,131,358.75
  5. Step 5: Solve for x
    x = 12,741,131,358.75/118,385.61
  6. Step 6: Final answer
    x = 107,623.99

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1.5x scale

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.