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Finding the Fourth Proportional to 86,657.70, 129,986.55 and 84,908.10

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Solution

The fourth proportional to 86,657.70, 129,986.55 and 84,908.10 is: 127,362.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,657.70 : 129,986.55 = 84,908.10 : x
  2. Step 2: Convert to fraction form
    86,657.70/129,986.55 = 84,908.10/x
  3. Step 3: Cross multiply
    86,657.70x = 129,986.55 × 84,908.10
  4. Step 4: Simplify right side
    86,657.70x = 11,036,910,986.06
  5. Step 5: Solve for x
    x = 11,036,910,986.06/86,657.70
  6. Step 6: Final answer
    x = 127,362.15

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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.