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Finding the Fourth Proportional to 121,019.40, 181,529.10 and 89,915.40

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Solution

The fourth proportional to 121,019.40, 181,529.10 and 89,915.40 is: 134,873.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,019.40 : 181,529.10 = 89,915.40 : x
  2. Step 2: Convert to fraction form
    121,019.40/181,529.10 = 89,915.40/x
  3. Step 3: Cross multiply
    121,019.40x = 181,529.10 × 89,915.40
  4. Step 4: Simplify right side
    121,019.40x = 16,322,261,638.14
  5. Step 5: Solve for x
    x = 16,322,261,638.14/121,019.40
  6. Step 6: Final answer
    x = 134,873.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.