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Finding the Fourth Proportional to 390,881.31, 539,472.59 and 225,277.06

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Solution

The fourth proportional to 390,881.31, 539,472.59 and 225,277.06 is: 310,914.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,881.31 : 539,472.59 = 225,277.06 : x
  2. Step 2: Convert to fraction form
    390,881.31/539,472.59 = 225,277.06/x
  3. Step 3: Cross multiply
    390,881.31x = 539,472.59 × 225,277.06
  4. Step 4: Simplify right side
    390,881.31x = 121,530,798,690.46
  5. Step 5: Solve for x
    x = 121,530,798,690.46/390,881.31
  6. Step 6: Final answer
    x = 310,914.83

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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.