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Finding the Fourth Proportional to 390,254.73, 538,562.03 and 220,485.21

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Solution

The fourth proportional to 390,254.73, 538,562.03 and 220,485.21 is: 304,275.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,254.73 : 538,562.03 = 220,485.21 : x
  2. Step 2: Convert to fraction form
    390,254.73/538,562.03 = 220,485.21/x
  3. Step 3: Cross multiply
    390,254.73x = 538,562.03 × 220,485.21
  4. Step 4: Simplify right side
    390,254.73x = 118,744,961,180.15
  5. Step 5: Solve for x
    x = 118,744,961,180.15/390,254.73
  6. Step 6: Final answer
    x = 304,275.52

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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.