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Finding the Fourth Proportional to 221,421.75, 305,560.40 and 125,928.33

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Solution

The fourth proportional to 221,421.75, 305,560.40 and 125,928.33 is: 173,780.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,421.75 : 305,560.40 = 125,928.33 : x
  2. Step 2: Convert to fraction form
    221,421.75/305,560.40 = 125,928.33/x
  3. Step 3: Cross multiply
    221,421.75x = 305,560.40 × 125,928.33
  4. Step 4: Simplify right side
    221,421.75x = 38,478,710,256.49
  5. Step 5: Solve for x
    x = 38,478,710,256.49/221,421.75
  6. Step 6: Final answer
    x = 173,780.17

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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.