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Finding the Fourth Proportional to 78,716.80, 118,075.20 and 75,436.30

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Solution

The fourth proportional to 78,716.80, 118,075.20 and 75,436.30 is: 113,154.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,716.80 : 118,075.20 = 75,436.30 : x
  2. Step 2: Convert to fraction form
    78,716.80/118,075.20 = 75,436.30/x
  3. Step 3: Cross multiply
    78,716.80x = 118,075.20 × 75,436.30
  4. Step 4: Simplify right side
    78,716.80x = 8,907,156,209.76
  5. Step 5: Solve for x
    x = 8,907,156,209.76/78,716.80
  6. Step 6: Final answer
    x = 113,154.45

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1.5x scale

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.