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Finding the Fourth Proportional to 390,344.81, 538,668.81 and 220,575.29

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Solution

The fourth proportional to 390,344.81, 538,668.81 and 220,575.29 is: 304,389.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,344.81 : 538,668.81 = 220,575.29 : x
  2. Step 2: Convert to fraction form
    390,344.81/538,668.81 = 220,575.29/x
  3. Step 3: Cross multiply
    390,344.81x = 538,668.81 × 220,575.29
  4. Step 4: Simplify right side
    390,344.81x = 118,817,026,286.36
  5. Step 5: Solve for x
    x = 118,817,026,286.36/390,344.81
  6. Step 6: Final answer
    x = 304,389.93

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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.