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Finding the Fourth Proportional to 86,898, 130,057.70 and 65,721.36

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Solution

The fourth proportional to 86,898, 130,057.70 and 65,721.36 is: 98,363.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,898 : 130,057.70 = 65,721.36 : x
  2. Step 2: Convert to fraction form
    86,898/130,057.70 = 65,721.36/x
  3. Step 3: Cross multiply
    86,898x = 130,057.70 × 65,721.36
  4. Step 4: Simplify right side
    86,898x = 8,547,568,593.87
  5. Step 5: Solve for x
    x = 8,547,568,593.87/86,898
  6. Step 6: Final answer
    x = 98,363.24

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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.