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Finding the Fourth Proportional to 217,085.10, 325,627.65 and 128,438.70

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Solution

The fourth proportional to 217,085.10, 325,627.65 and 128,438.70 is: 192,658.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,085.10 : 325,627.65 = 128,438.70 : x
  2. Step 2: Convert to fraction form
    217,085.10/325,627.65 = 128,438.70/x
  3. Step 3: Cross multiply
    217,085.10x = 325,627.65 × 128,438.70
  4. Step 4: Simplify right side
    217,085.10x = 41,823,192,050.06
  5. Step 5: Solve for x
    x = 41,823,192,050.06/217,085.10
  6. Step 6: Final answer
    x = 192,658.05

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1.5x scale

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.