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Finding the Fourth Proportional to 121,428.60, 182,142.90 and 119,095.80

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Solution

The fourth proportional to 121,428.60, 182,142.90 and 119,095.80 is: 178,643.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,428.60 : 182,142.90 = 119,095.80 : x
  2. Step 2: Convert to fraction form
    121,428.60/182,142.90 = 119,095.80/x
  3. Step 3: Cross multiply
    121,428.60x = 182,142.90 × 119,095.80
  4. Step 4: Simplify right side
    121,428.60x = 21,692,454,389.82
  5. Step 5: Solve for x
    x = 21,692,454,389.82/121,428.60
  6. Step 6: Final answer
    x = 178,643.70

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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.