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Finding the Fourth Proportional to 86,019.20, 128,875.20 and 73,731.20

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Solution

The fourth proportional to 86,019.20, 128,875.20 and 73,731.20 is: 110,465.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019.20 : 128,875.20 = 73,731.20 : x
  2. Step 2: Convert to fraction form
    86,019.20/128,875.20 = 73,731.20/x
  3. Step 3: Cross multiply
    86,019.20x = 128,875.20 × 73,731.20
  4. Step 4: Simplify right side
    86,019.20x = 9,502,123,146.24
  5. Step 5: Solve for x
    x = 9,502,123,146.24/86,019.20
  6. Step 6: Final answer
    x = 110,465.14

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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.