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Finding the Fourth Proportional to 86,657.80, 129,986.70 and 70,911.40

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Solution

The fourth proportional to 86,657.80, 129,986.70 and 70,911.40 is: 106,367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,657.80 : 129,986.70 = 70,911.40 : x
  2. Step 2: Convert to fraction form
    86,657.80/129,986.70 = 70,911.40/x
  3. Step 3: Cross multiply
    86,657.80x = 129,986.70 × 70,911.40
  4. Step 4: Simplify right side
    86,657.80x = 9,217,538,878.38
  5. Step 5: Solve for x
    x = 9,217,538,878.38/86,657.80
  6. Step 6: Final answer
    x = 106,367.10

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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.