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Finding the Fourth Proportional to 520,618.36, 781,047.84 and 221,108.74

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Solution

The fourth proportional to 520,618.36, 781,047.84 and 221,108.74 is: 331,714.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,618.36 : 781,047.84 = 221,108.74 : x
  2. Step 2: Convert to fraction form
    520,618.36/781,047.84 = 221,108.74/x
  3. Step 3: Cross multiply
    520,618.36x = 781,047.84 × 221,108.74
  4. Step 4: Simplify right side
    520,618.36x = 172,696,503,782.12
  5. Step 5: Solve for x
    x = 172,696,503,782.12/520,618.36
  6. Step 6: Final answer
    x = 331,714.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.