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Finding the Fourth Proportional to 399,637.40, 551,493.17 and 218,345.43

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Solution

The fourth proportional to 399,637.40, 551,493.17 and 218,345.43 is: 301,313.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,637.40 : 551,493.17 = 218,345.43 : x
  2. Step 2: Convert to fraction form
    399,637.40/551,493.17 = 218,345.43/x
  3. Step 3: Cross multiply
    399,637.40x = 551,493.17 × 218,345.43
  4. Step 4: Simplify right side
    399,637.40x = 120,416,013,345.71
  5. Step 5: Solve for x
    x = 120,416,013,345.71/399,637.40
  6. Step 6: Final answer
    x = 301,313.17

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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.