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Finding the Fourth Proportional to 315,581.39, 435,505.78 and 172,345.65

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Solution

The fourth proportional to 315,581.39, 435,505.78 and 172,345.65 is: 237,838.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,581.39 : 435,505.78 = 172,345.65 : x
  2. Step 2: Convert to fraction form
    315,581.39/435,505.78 = 172,345.65/x
  3. Step 3: Cross multiply
    315,581.39x = 435,505.78 × 172,345.65
  4. Step 4: Simplify right side
    315,581.39x = 75,057,526,732.86
  5. Step 5: Solve for x
    x = 75,057,526,732.86/315,581.39
  6. Step 6: Final answer
    x = 237,838.89

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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.