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Finding the Fourth Proportional to 390,245.36, 538,537.48 and 220,479.44

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Solution

The fourth proportional to 390,245.36, 538,537.48 and 220,479.44 is: 304,261.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,245.36 : 538,537.48 = 220,479.44 : x
  2. Step 2: Convert to fraction form
    390,245.36/538,537.48 = 220,479.44/x
  3. Step 3: Cross multiply
    390,245.36x = 538,537.48 × 220,479.44
  4. Step 4: Simplify right side
    390,245.36x = 118,736,442,009.41
  5. Step 5: Solve for x
    x = 118,736,442,009.41/390,245.36
  6. Step 6: Final answer
    x = 304,261.00

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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.