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Finding the Fourth Proportional to 890,999.40, 1,336,805.10 and 260,005.80

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Solution

The fourth proportional to 890,999.40, 1,336,805.10 and 260,005.80 is: 390,097.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    890,999.40 : 1,336,805.10 = 260,005.80 : x
  2. Step 2: Convert to fraction form
    890,999.40/1,336,805.10 = 260,005.80/x
  3. Step 3: Cross multiply
    890,999.40x = 1,336,805.10 × 260,005.80
  4. Step 4: Simplify right side
    890,999.40x = 347,577,079,469.58
  5. Step 5: Solve for x
    x = 347,577,079,469.58/890,999.40
  6. Step 6: Final answer
    x = 390,097.99

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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.