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Finding the Fourth Proportional to 402,631.34, 555,642 and 218,882.30

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Solution

The fourth proportional to 402,631.34, 555,642 and 218,882.30 is: 302,063.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,631.34 : 555,642 = 218,882.30 : x
  2. Step 2: Convert to fraction form
    402,631.34/555,642 = 218,882.30/x
  3. Step 3: Cross multiply
    402,631.34x = 555,642 × 218,882.30
  4. Step 4: Simplify right side
    402,631.34x = 121,620,198,936.60
  5. Step 5: Solve for x
    x = 121,620,198,936.60/402,631.34
  6. Step 6: Final answer
    x = 302,063.42

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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.