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Finding the Fourth Proportional to 390,302.81, 538,610.85 and 220,533.29

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Solution

The fourth proportional to 390,302.81, 538,610.85 and 220,533.29 is: 304,331.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,302.81 : 538,610.85 = 220,533.29 : x
  2. Step 2: Convert to fraction form
    390,302.81/538,610.85 = 220,533.29/x
  3. Step 3: Cross multiply
    390,302.81x = 538,610.85 × 220,533.29
  4. Step 4: Simplify right side
    390,302.81x = 118,781,620,087.14
  5. Step 5: Solve for x
    x = 118,781,620,087.14/390,302.81
  6. Step 6: Final answer
    x = 304,331.97

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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.