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Finding the Fourth Proportional to 225,031.25, 310,540.13 and 128,240.87

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Solution

The fourth proportional to 225,031.25, 310,540.13 and 128,240.87 is: 176,970.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,031.25 : 310,540.13 = 128,240.87 : x
  2. Step 2: Convert to fraction form
    225,031.25/310,540.13 = 128,240.87/x
  3. Step 3: Cross multiply
    225,031.25x = 310,540.13 × 128,240.87
  4. Step 4: Simplify right side
    225,031.25x = 39,823,934,728.11
  5. Step 5: Solve for x
    x = 39,823,934,728.11/225,031.25
  6. Step 6: Final answer
    x = 176,970.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.