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Finding the Fourth Proportional to 390,170.89, 538,479.54 and 220,415.95

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Solution

The fourth proportional to 390,170.89, 538,479.54 and 220,415.95 is: 304,198.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,170.89 : 538,479.54 = 220,415.95 : x
  2. Step 2: Convert to fraction form
    390,170.89/538,479.54 = 220,415.95/x
  3. Step 3: Cross multiply
    390,170.89x = 538,479.54 × 220,415.95
  4. Step 4: Simplify right side
    390,170.89x = 118,689,479,364.66
  5. Step 5: Solve for x
    x = 118,689,479,364.66/390,170.89
  6. Step 6: Final answer
    x = 304,198.70

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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.