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Finding the Fourth Proportional to 399,639.20, 551,495.57 and 218,347.22

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Solution

The fourth proportional to 399,639.20, 551,495.57 and 218,347.22 is: 301,315.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,639.20 : 551,495.57 = 218,347.22 : x
  2. Step 2: Convert to fraction form
    399,639.20/551,495.57 = 218,347.22/x
  3. Step 3: Cross multiply
    399,639.20x = 551,495.57 × 218,347.22
  4. Step 4: Simplify right side
    399,639.20x = 120,417,527,510.48
  5. Step 5: Solve for x
    x = 120,417,527,510.48/399,639.20
  6. Step 6: Final answer
    x = 301,315.61

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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.