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Finding the Fourth Proportional to 390,301.30, 538,608.78 and 220,531.78

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Solution

The fourth proportional to 390,301.30, 538,608.78 and 220,531.78 is: 304,329.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,301.30 : 538,608.78 = 220,531.78 : x
  2. Step 2: Convert to fraction form
    390,301.30/538,608.78 = 220,531.78/x
  3. Step 3: Cross multiply
    390,301.30x = 538,608.78 × 220,531.78
  4. Step 4: Simplify right side
    390,301.30x = 118,780,352,977.03
  5. Step 5: Solve for x
    x = 118,780,352,977.03/390,301.30
  6. Step 6: Final answer
    x = 304,329.89

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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.