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Finding the Fourth Proportional to 86,748.64, 130,022.56 and 39,903.20

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Solution

The fourth proportional to 86,748.64, 130,022.56 and 39,903.20 is: 59,808.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,748.64 : 130,022.56 = 39,903.20 : x
  2. Step 2: Convert to fraction form
    86,748.64/130,022.56 = 39,903.20/x
  3. Step 3: Cross multiply
    86,748.64x = 130,022.56 × 39,903.20
  4. Step 4: Simplify right side
    86,748.64x = 5,188,316,216.19
  5. Step 5: Solve for x
    x = 5,188,316,216.19/86,748.64
  6. Step 6: Final answer
    x = 59,808.62

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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.