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Finding the Fourth Proportional to 399,549.45, 551,390.10 and 218,264.38

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Solution

The fourth proportional to 399,549.45, 551,390.10 and 218,264.38 is: 301,211.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,549.45 : 551,390.10 = 218,264.38 : x
  2. Step 2: Convert to fraction form
    399,549.45/551,390.10 = 218,264.38/x
  3. Step 3: Cross multiply
    399,549.45x = 551,390.10 × 218,264.38
  4. Step 4: Simplify right side
    399,549.45x = 120,348,818,314.64
  5. Step 5: Solve for x
    x = 120,348,818,314.64/399,549.45
  6. Step 6: Final answer
    x = 301,211.32

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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.