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Finding the Fourth Proportional to 138,315.60, 207,667.80 and 85,827.60

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Solution

The fourth proportional to 138,315.60, 207,667.80 and 85,827.60 is: 128,862.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,315.60 : 207,667.80 = 85,827.60 : x
  2. Step 2: Convert to fraction form
    138,315.60/207,667.80 = 85,827.60/x
  3. Step 3: Cross multiply
    138,315.60x = 207,667.80 × 85,827.60
  4. Step 4: Simplify right side
    138,315.60x = 17,823,628,871.28
  5. Step 5: Solve for x
    x = 17,823,628,871.28/138,315.60
  6. Step 6: Final answer
    x = 128,862.03

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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.