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Finding the Fourth Proportional to 399,498.91, 551,307.88 and 218,210.84

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Solution

The fourth proportional to 399,498.91, 551,307.88 and 218,210.84 is: 301,130.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,498.91 : 551,307.88 = 218,210.84 : x
  2. Step 2: Convert to fraction form
    399,498.91/551,307.88 = 218,210.84/x
  3. Step 3: Cross multiply
    399,498.91x = 551,307.88 × 218,210.84
  4. Step 4: Simplify right side
    399,498.91x = 120,301,357,244.45
  5. Step 5: Solve for x
    x = 120,301,357,244.45/399,498.91
  6. Step 6: Final answer
    x = 301,130.63

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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.