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Finding the Fourth Proportional to 391,602.32, 540,498.12 and 221,930

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Solution

The fourth proportional to 391,602.32, 540,498.12 and 221,930 is: 306,312.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,602.32 : 540,498.12 = 221,930 : x
  2. Step 2: Convert to fraction form
    391,602.32/540,498.12 = 221,930/x
  3. Step 3: Cross multiply
    391,602.32x = 540,498.12 × 221,930
  4. Step 4: Simplify right side
    391,602.32x = 119,952,747,771.60
  5. Step 5: Solve for x
    x = 119,952,747,771.60/391,602.32
  6. Step 6: Final answer
    x = 306,312.66

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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.