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Finding the Fourth Proportional to 128,916.40, 193,374.60 and 97,812.40

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Solution

The fourth proportional to 128,916.40, 193,374.60 and 97,812.40 is: 146,718.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,916.40 : 193,374.60 = 97,812.40 : x
  2. Step 2: Convert to fraction form
    128,916.40/193,374.60 = 97,812.40/x
  3. Step 3: Cross multiply
    128,916.40x = 193,374.60 × 97,812.40
  4. Step 4: Simplify right side
    128,916.40x = 18,914,433,725.04
  5. Step 5: Solve for x
    x = 18,914,433,725.04/128,916.40
  6. Step 6: Final answer
    x = 146,718.60

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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.