Home / 86,988.49-130,220.12-78,672.42

Finding the Fourth Proportional to 86,988.49, 130,220.12 and 78,672.42

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Solution

The fourth proportional to 86,988.49, 130,220.12 and 78,672.42 is: 117,771.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,988.49 : 130,220.12 = 78,672.42 : x
  2. Step 2: Convert to fraction form
    86,988.49/130,220.12 = 78,672.42/x
  3. Step 3: Cross multiply
    86,988.49x = 130,220.12 × 78,672.42
  4. Step 4: Simplify right side
    86,988.49x = 10,244,732,169.77
  5. Step 5: Solve for x
    x = 10,244,732,169.77/86,988.49
  6. Step 6: Final answer
    x = 117,771.13

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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.