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Finding the Fourth Proportional to 86,643.28, 129,964.68 and 70,896.88

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Solution

The fourth proportional to 86,643.28, 129,964.68 and 70,896.88 is: 106,345.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,643.28 : 129,964.68 = 70,896.88 : x
  2. Step 2: Convert to fraction form
    86,643.28/129,964.68 = 70,896.88/x
  3. Step 3: Cross multiply
    86,643.28x = 129,964.68 × 70,896.88
  4. Step 4: Simplify right side
    86,643.28x = 9,214,090,322.20
  5. Step 5: Solve for x
    x = 9,214,090,322.20/86,643.28
  6. Step 6: Final answer
    x = 106,345.12

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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.