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Finding the Fourth Proportional to 398,488.62, 549,898.18 and 217,196.65

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Solution

The fourth proportional to 398,488.62, 549,898.18 and 217,196.65 is: 299,722.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,488.62 : 549,898.18 = 217,196.65 : x
  2. Step 2: Convert to fraction form
    398,488.62/549,898.18 = 217,196.65/x
  3. Step 3: Cross multiply
    398,488.62x = 549,898.18 × 217,196.65
  4. Step 4: Simplify right side
    398,488.62x = 119,436,039,787.61
  5. Step 5: Solve for x
    x = 119,436,039,787.61/398,488.62
  6. Step 6: Final answer
    x = 299,722.59

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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.