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Finding the Fourth Proportional to 390,773.25, 539,267.09 and 221,003.73

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Solution

The fourth proportional to 390,773.25, 539,267.09 and 221,003.73 is: 304,985.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,773.25 : 539,267.09 = 221,003.73 : x
  2. Step 2: Convert to fraction form
    390,773.25/539,267.09 = 221,003.73/x
  3. Step 3: Cross multiply
    390,773.25x = 539,267.09 × 221,003.73
  4. Step 4: Simplify right side
    390,773.25x = 119,180,037,251.23
  5. Step 5: Solve for x
    x = 119,180,037,251.23/390,773.25
  6. Step 6: Final answer
    x = 304,985.15

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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.