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Finding the Fourth Proportional to 86,732.70, 130,012.65 and 39,903.90

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Solution

The fourth proportional to 86,732.70, 130,012.65 and 39,903.90 is: 59,816.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,732.70 : 130,012.65 = 39,903.90 : x
  2. Step 2: Convert to fraction form
    86,732.70/130,012.65 = 39,903.90/x
  3. Step 3: Cross multiply
    86,732.70x = 130,012.65 × 39,903.90
  4. Step 4: Simplify right side
    86,732.70x = 5,188,011,784.34
  5. Step 5: Solve for x
    x = 5,188,011,784.34/86,732.70
  6. Step 6: Final answer
    x = 59,816.10

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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.