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Finding the Fourth Proportional to 81,069.62, 120,989.55 and 78,970.10

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Solution

The fourth proportional to 81,069.62, 120,989.55 and 78,970.10 is: 117,856.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,069.62 : 120,989.55 = 78,970.10 : x
  2. Step 2: Convert to fraction form
    81,069.62/120,989.55 = 78,970.10/x
  3. Step 3: Cross multiply
    81,069.62x = 120,989.55 × 78,970.10
  4. Step 4: Simplify right side
    81,069.62x = 9,554,556,467.60
  5. Step 5: Solve for x
    x = 9,554,556,467.60/81,069.62
  6. Step 6: Final answer
    x = 117,856.19

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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.