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Finding the Fourth Proportional to 78,118.50, 117,510.36 and 70,811.20

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Solution

The fourth proportional to 78,118.50, 117,510.36 and 70,811.20 is: 106,518.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,118.50 : 117,510.36 = 70,811.20 : x
  2. Step 2: Convert to fraction form
    78,118.50/117,510.36 = 70,811.20/x
  3. Step 3: Cross multiply
    78,118.50x = 117,510.36 × 70,811.20
  4. Step 4: Simplify right side
    78,118.50x = 8,321,049,310.26
  5. Step 5: Solve for x
    x = 8,321,049,310.26/78,118.50
  6. Step 6: Final answer
    x = 106,518.29

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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.