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Finding the Fourth Proportional to 86,528.40, 129,850.65 and 30,368.40

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Solution

The fourth proportional to 86,528.40, 129,850.65 and 30,368.40 is: 45,572.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,528.40 : 129,850.65 = 30,368.40 : x
  2. Step 2: Convert to fraction form
    86,528.40/129,850.65 = 30,368.40/x
  3. Step 3: Cross multiply
    86,528.40x = 129,850.65 × 30,368.40
  4. Step 4: Simplify right side
    86,528.40x = 3,943,356,479.46
  5. Step 5: Solve for x
    x = 3,943,356,479.46/86,528.40
  6. Step 6: Final answer
    x = 45,572.97

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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.