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Finding the Fourth Proportional to 399,685.66, 551,559.65 and 218,393.69

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Solution

The fourth proportional to 399,685.66, 551,559.65 and 218,393.69 is: 301,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,685.66 : 551,559.65 = 218,393.69 : x
  2. Step 2: Convert to fraction form
    399,685.66/551,559.65 = 218,393.69/x
  3. Step 3: Cross multiply
    399,685.66x = 551,559.65 × 218,393.69
  4. Step 4: Simplify right side
    399,685.66x = 120,457,143,368.84
  5. Step 5: Solve for x
    x = 120,457,143,368.84/399,685.66
  6. Step 6: Final answer
    x = 301,379.70

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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.