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Finding the Fourth Proportional to 399,316.10, 551,078.56 and 218,044.90

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Solution

The fourth proportional to 399,316.10, 551,078.56 and 218,044.90 is: 300,914.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,316.10 : 551,078.56 = 218,044.90 : x
  2. Step 2: Convert to fraction form
    399,316.10/551,078.56 = 218,044.90/x
  3. Step 3: Cross multiply
    399,316.10x = 551,078.56 × 218,044.90
  4. Step 4: Simplify right side
    399,316.10x = 120,159,869,507.34
  5. Step 5: Solve for x
    x = 120,159,869,507.34/399,316.10
  6. Step 6: Final answer
    x = 300,914.16

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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.