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Finding the Fourth Proportional to 312,521.72, 431,279.78 and 169,281.40

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Solution

The fourth proportional to 312,521.72, 431,279.78 and 169,281.40 is: 233,608.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,521.72 : 431,279.78 = 169,281.40 : x
  2. Step 2: Convert to fraction form
    312,521.72/431,279.78 = 169,281.40/x
  3. Step 3: Cross multiply
    312,521.72x = 431,279.78 × 169,281.40
  4. Step 4: Simplify right side
    312,521.72x = 73,007,644,950.09
  5. Step 5: Solve for x
    x = 73,007,644,950.09/312,521.72
  6. Step 6: Final answer
    x = 233,608.23

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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.