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Finding the Fourth Proportional to 217,862.70, 300,678.75 and 122,369.40

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Solution

The fourth proportional to 217,862.70, 300,678.75 and 122,369.40 is: 168,885.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,862.70 : 300,678.75 = 122,369.40 : x
  2. Step 2: Convert to fraction form
    217,862.70/300,678.75 = 122,369.40/x
  3. Step 3: Cross multiply
    217,862.70x = 300,678.75 × 122,369.40
  4. Step 4: Simplify right side
    217,862.70x = 36,793,878,230.25
  5. Step 5: Solve for x
    x = 36,793,878,230.25/217,862.70
  6. Step 6: Final answer
    x = 168,885.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.