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Finding the Fourth Proportional to 390,302.30, 538,610.16 and 220,532.78

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Solution

The fourth proportional to 390,302.30, 538,610.16 and 220,532.78 is: 304,331.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,302.30 : 538,610.16 = 220,532.78 : x
  2. Step 2: Convert to fraction form
    390,302.30/538,610.16 = 220,532.78/x
  3. Step 3: Cross multiply
    390,302.30x = 538,610.16 × 220,532.78
  4. Step 4: Simplify right side
    390,302.30x = 118,781,195,921.05
  5. Step 5: Solve for x
    x = 118,781,195,921.05/390,302.30
  6. Step 6: Final answer
    x = 304,331.27

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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.