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Finding the Fourth Proportional to 390,296.31, 538,601.88 and 220,526.79

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Solution

The fourth proportional to 390,296.31, 538,601.88 and 220,526.79 is: 304,323.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,296.31 : 538,601.88 = 220,526.79 : x
  2. Step 2: Convert to fraction form
    390,296.31/538,601.88 = 220,526.79/x
  3. Step 3: Cross multiply
    390,296.31x = 538,601.88 × 220,526.79
  4. Step 4: Simplify right side
    390,296.31x = 118,776,143,684.37
  5. Step 5: Solve for x
    x = 118,776,143,684.37/390,296.31
  6. Step 6: Final answer
    x = 304,323.00

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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.