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Finding the Fourth Proportional to 137,916.60, 207,069.30 and 85,428.60

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Solution

The fourth proportional to 137,916.60, 207,069.30 and 85,428.60 is: 128,263.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,916.60 : 207,069.30 = 85,428.60 : x
  2. Step 2: Convert to fraction form
    137,916.60/207,069.30 = 85,428.60/x
  3. Step 3: Cross multiply
    137,916.60x = 207,069.30 × 85,428.60
  4. Step 4: Simplify right side
    137,916.60x = 17,689,640,401.98
  5. Step 5: Solve for x
    x = 17,689,640,401.98/137,916.60
  6. Step 6: Final answer
    x = 128,263.32

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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.