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Finding the Fourth Proportional to 390,352.56, 538,679.53 and 220,583.04

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Solution

The fourth proportional to 390,352.56, 538,679.53 and 220,583.04 is: 304,400.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,352.56 : 538,679.53 = 220,583.04 : x
  2. Step 2: Convert to fraction form
    390,352.56/538,679.53 = 220,583.04/x
  3. Step 3: Cross multiply
    390,352.56x = 538,679.53 × 220,583.04
  4. Step 4: Simplify right side
    390,352.56x = 118,823,568,313.17
  5. Step 5: Solve for x
    x = 118,823,568,313.17/390,352.56
  6. Step 6: Final answer
    x = 304,400.64

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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.