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Finding the Fourth Proportional to 209,312.16, 313,979.10 and 69,081.72

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Solution

The fourth proportional to 209,312.16, 313,979.10 and 69,081.72 is: 103,626.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,312.16 : 313,979.10 = 69,081.72 : x
  2. Step 2: Convert to fraction form
    209,312.16/313,979.10 = 69,081.72/x
  3. Step 3: Cross multiply
    209,312.16x = 313,979.10 × 69,081.72
  4. Step 4: Simplify right side
    209,312.16x = 21,690,216,272.05
  5. Step 5: Solve for x
    x = 21,690,216,272.05/209,312.16
  6. Step 6: Final answer
    x = 103,626.16

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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.