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Finding the Fourth Proportional to 225,300.90, 310,909.08 and 128,502.57

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Solution

The fourth proportional to 225,300.90, 310,909.08 and 128,502.57 is: 177,330.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,300.90 : 310,909.08 = 128,502.57 : x
  2. Step 2: Convert to fraction form
    225,300.90/310,909.08 = 128,502.57/x
  3. Step 3: Cross multiply
    225,300.90x = 310,909.08 × 128,502.57
  4. Step 4: Simplify right side
    225,300.90x = 39,952,615,816.34
  5. Step 5: Solve for x
    x = 39,952,615,816.34/225,300.90
  6. Step 6: Final answer
    x = 177,330.03

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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.