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Finding the Fourth Proportional to 423,549.05, 635,401.53 and 139,255.65

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Solution

The fourth proportional to 423,549.05, 635,401.53 and 139,255.65 is: 208,909.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,549.05 : 635,401.53 = 139,255.65 : x
  2. Step 2: Convert to fraction form
    423,549.05/635,401.53 = 139,255.65/x
  3. Step 3: Cross multiply
    423,549.05x = 635,401.53 × 139,255.65
  4. Step 4: Simplify right side
    423,549.05x = 88,483,253,071.14
  5. Step 5: Solve for x
    x = 88,483,253,071.14/423,549.05
  6. Step 6: Final answer
    x = 208,909.11

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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.