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Finding the Fourth Proportional to 86,752.80, 130,007.70 and 69,013.80

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Solution

The fourth proportional to 86,752.80, 130,007.70 and 69,013.80 is: 103,424.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,752.80 : 130,007.70 = 69,013.80 : x
  2. Step 2: Convert to fraction form
    86,752.80/130,007.70 = 69,013.80/x
  3. Step 3: Cross multiply
    86,752.80x = 130,007.70 × 69,013.80
  4. Step 4: Simplify right side
    86,752.80x = 8,972,325,406.26
  5. Step 5: Solve for x
    x = 8,972,325,406.26/86,752.80
  6. Step 6: Final answer
    x = 103,424.04

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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.