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Finding the Fourth Proportional to 305,521, 421,621.86 and 171,387.88

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Solution

The fourth proportional to 305,521, 421,621.86 and 171,387.88 is: 236,516.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,521 : 421,621.86 = 171,387.88 : x
  2. Step 2: Convert to fraction form
    305,521/421,621.86 = 171,387.88/x
  3. Step 3: Cross multiply
    305,521x = 421,621.86 × 171,387.88
  4. Step 4: Simplify right side
    305,521x = 72,260,876,747.06
  5. Step 5: Solve for x
    x = 72,260,876,747.06/305,521
  6. Step 6: Final answer
    x = 236,516.89

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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.