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Finding the Fourth Proportional to 309,909.12, 464,802.42 and 85,211.58

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Solution

The fourth proportional to 309,909.12, 464,802.42 and 85,211.58 is: 127,800.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,909.12 : 464,802.42 = 85,211.58 : x
  2. Step 2: Convert to fraction form
    309,909.12/464,802.42 = 85,211.58/x
  3. Step 3: Cross multiply
    309,909.12x = 464,802.42 × 85,211.58
  4. Step 4: Simplify right side
    309,909.12x = 39,606,548,596.02
  5. Step 5: Solve for x
    x = 39,606,548,596.02/309,909.12
  6. Step 6: Final answer
    x = 127,800.53

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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.