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Finding the Fourth Proportional to 221,386.89, 305,459.56 and 129,491.88

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Solution

The fourth proportional to 221,386.89, 305,459.56 and 129,491.88 is: 178,667.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,386.89 : 305,459.56 = 129,491.88 : x
  2. Step 2: Convert to fraction form
    221,386.89/305,459.56 = 129,491.88/x
  3. Step 3: Cross multiply
    221,386.89x = 305,459.56 × 129,491.88
  4. Step 4: Simplify right side
    221,386.89x = 39,554,532,688.37
  5. Step 5: Solve for x
    x = 39,554,532,688.37/221,386.89
  6. Step 6: Final answer
    x = 178,667.01

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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.