Home / 399,297.18-551,015.64-218,005.78

Finding the Fourth Proportional to 399,297.18, 551,015.64 and 218,005.78

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Solution

The fourth proportional to 399,297.18, 551,015.64 and 218,005.78 is: 300,840.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,297.18 : 551,015.64 = 218,005.78 : x
  2. Step 2: Convert to fraction form
    399,297.18/551,015.64 = 218,005.78/x
  3. Step 3: Cross multiply
    399,297.18x = 551,015.64 × 218,005.78
  4. Step 4: Simplify right side
    399,297.18x = 120,124,594,390.40
  5. Step 5: Solve for x
    x = 120,124,594,390.40/399,297.18
  6. Step 6: Final answer
    x = 300,840.08

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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.