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Finding the Fourth Proportional to 86,653.20, 129,979.80 and 74,211.60

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Solution

The fourth proportional to 86,653.20, 129,979.80 and 74,211.60 is: 111,317.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,653.20 : 129,979.80 = 74,211.60 : x
  2. Step 2: Convert to fraction form
    86,653.20/129,979.80 = 74,211.60/x
  3. Step 3: Cross multiply
    86,653.20x = 129,979.80 × 74,211.60
  4. Step 4: Simplify right side
    86,653.20x = 9,646,008,925.68
  5. Step 5: Solve for x
    x = 9,646,008,925.68/86,653.20
  6. Step 6: Final answer
    x = 111,317.40

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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.