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Finding the Fourth Proportional to 145,431.60, 217,878.60 and 82,916.40

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Solution

The fourth proportional to 145,431.60, 217,878.60 and 82,916.40 is: 124,221.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,431.60 : 217,878.60 = 82,916.40 : x
  2. Step 2: Convert to fraction form
    145,431.60/217,878.60 = 82,916.40/x
  3. Step 3: Cross multiply
    145,431.60x = 217,878.60 × 82,916.40
  4. Step 4: Simplify right side
    145,431.60x = 18,065,709,149.04
  5. Step 5: Solve for x
    x = 18,065,709,149.04/145,431.60
  6. Step 6: Final answer
    x = 124,221.35

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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.