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Finding the Fourth Proportional to 86,615.80, 130,020.90 and 66,981.40

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Solution

The fourth proportional to 86,615.80, 130,020.90 and 66,981.40 is: 100,547.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,615.80 : 130,020.90 = 66,981.40 : x
  2. Step 2: Convert to fraction form
    86,615.80/130,020.90 = 66,981.40/x
  3. Step 3: Cross multiply
    86,615.80x = 130,020.90 × 66,981.40
  4. Step 4: Simplify right side
    86,615.80x = 8,708,981,911.26
  5. Step 5: Solve for x
    x = 8,708,981,911.26/86,615.80
  6. Step 6: Final answer
    x = 100,547.27

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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.