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Finding the Fourth Proportional to 86,455.20, 129,682.80 and 51,376.80

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Solution

The fourth proportional to 86,455.20, 129,682.80 and 51,376.80 is: 77,065.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,455.20 : 129,682.80 = 51,376.80 : x
  2. Step 2: Convert to fraction form
    86,455.20/129,682.80 = 51,376.80/x
  3. Step 3: Cross multiply
    86,455.20x = 129,682.80 × 51,376.80
  4. Step 4: Simplify right side
    86,455.20x = 6,662,687,279.04
  5. Step 5: Solve for x
    x = 6,662,687,279.04/86,455.20
  6. Step 6: Final answer
    x = 77,065.20

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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.