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Finding the Fourth Proportional to 399,642.20, 551,499.71 and 218,350.23

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Solution

The fourth proportional to 399,642.20, 551,499.71 and 218,350.23 is: 301,319.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,642.20 : 551,499.71 = 218,350.23 : x
  2. Step 2: Convert to fraction form
    399,642.20/551,499.71 = 218,350.23/x
  3. Step 3: Cross multiply
    399,642.20x = 551,499.71 × 218,350.23
  4. Step 4: Simplify right side
    399,642.20x = 120,420,088,465.74
  5. Step 5: Solve for x
    x = 120,420,088,465.74/399,642.20
  6. Step 6: Final answer
    x = 301,319.75

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1.5x scale

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.