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Finding the Fourth Proportional to 78,808.85, 117,620.88 and 72,116.63

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Solution

The fourth proportional to 78,808.85, 117,620.88 and 72,116.63 is: 107,632.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,808.85 : 117,620.88 = 72,116.63 : x
  2. Step 2: Convert to fraction form
    78,808.85/117,620.88 = 72,116.63/x
  3. Step 3: Cross multiply
    78,808.85x = 117,620.88 × 72,116.63
  4. Step 4: Simplify right side
    78,808.85x = 8,482,421,674.26
  5. Step 5: Solve for x
    x = 8,482,421,674.26/78,808.85
  6. Step 6: Final answer
    x = 107,632.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.