Home / 221,261.35-305,251.45-128,065.77

Finding the Fourth Proportional to 221,261.35, 305,251.45 and 128,065.77

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Solution

The fourth proportional to 221,261.35, 305,251.45 and 128,065.77 is: 176,679.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,261.35 : 305,251.45 = 128,065.77 : x
  2. Step 2: Convert to fraction form
    221,261.35/305,251.45 = 128,065.77/x
  3. Step 3: Cross multiply
    221,261.35x = 305,251.45 × 128,065.77
  4. Step 4: Simplify right side
    221,261.35x = 39,092,261,987.87
  5. Step 5: Solve for x
    x = 39,092,261,987.87/221,261.35
  6. Step 6: Final answer
    x = 176,679.13

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1.5x scale

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.