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Finding the Fourth Proportional to 399,347.16, 551,121.30 and 218,075.88

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Solution

The fourth proportional to 399,347.16, 551,121.30 and 218,075.88 is: 300,956.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,347.16 : 551,121.30 = 218,075.88 : x
  2. Step 2: Convert to fraction form
    399,347.16/551,121.30 = 218,075.88/x
  3. Step 3: Cross multiply
    399,347.16x = 551,121.30 × 218,075.88
  4. Step 4: Simplify right side
    399,347.16x = 120,186,262,484.24
  5. Step 5: Solve for x
    x = 120,186,262,484.24/399,347.16
  6. Step 6: Final answer
    x = 300,956.85

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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.