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Finding the Fourth Proportional to 390,571.71, 538,981.83 and 220,805.88

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Solution

The fourth proportional to 390,571.71, 538,981.83 and 220,805.88 is: 304,708.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,571.71 : 538,981.83 = 220,805.88 : x
  2. Step 2: Convert to fraction form
    390,571.71/538,981.83 = 220,805.88/x
  3. Step 3: Cross multiply
    390,571.71x = 538,981.83 × 220,805.88
  4. Step 4: Simplify right side
    390,571.71x = 119,010,357,277.16
  5. Step 5: Solve for x
    x = 119,010,357,277.16/390,571.71
  6. Step 6: Final answer
    x = 304,708.08

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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.