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Finding the Fourth Proportional to 315,668.72, 435,606.18 and 172,426.70

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Solution

The fourth proportional to 315,668.72, 435,606.18 and 172,426.70 is: 237,939.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,668.72 : 435,606.18 = 172,426.70 : x
  2. Step 2: Convert to fraction form
    315,668.72/435,606.18 = 172,426.70/x
  3. Step 3: Cross multiply
    315,668.72x = 435,606.18 × 172,426.70
  4. Step 4: Simplify right side
    315,668.72x = 75,110,136,117.01
  5. Step 5: Solve for x
    x = 75,110,136,117.01/315,668.72
  6. Step 6: Final answer
    x = 237,939.75

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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.