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Finding the Fourth Proportional to 306,988.80, 423,644.16 and 172,853.76

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Solution

The fourth proportional to 306,988.80, 423,644.16 and 172,853.76 is: 238,537.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,988.80 : 423,644.16 = 172,853.76 : x
  2. Step 2: Convert to fraction form
    306,988.80/423,644.16 = 172,853.76/x
  3. Step 3: Cross multiply
    306,988.80x = 423,644.16 × 172,853.76
  4. Step 4: Simplify right side
    306,988.80x = 73,228,485,958.04
  5. Step 5: Solve for x
    x = 73,228,485,958.04/306,988.80
  6. Step 6: Final answer
    x = 238,537.97

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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.