Home / 426,136.08-638,416.80-215,270.40

Finding the Fourth Proportional to 426,136.08, 638,416.80 and 215,270.40

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Solution

The fourth proportional to 426,136.08, 638,416.80 and 215,270.40 is: 322,507.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,136.08 : 638,416.80 = 215,270.40 : x
  2. Step 2: Convert to fraction form
    426,136.08/638,416.80 = 215,270.40/x
  3. Step 3: Cross multiply
    426,136.08x = 638,416.80 × 215,270.40
  4. Step 4: Simplify right side
    426,136.08x = 137,432,239,902.72
  5. Step 5: Solve for x
    x = 137,432,239,902.72/426,136.08
  6. Step 6: Final answer
    x = 322,507.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.