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Finding the Fourth Proportional to 899.45, 1,349.62 and 406.20

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Solution

The fourth proportional to 899.45, 1,349.62 and 406.20 is: 609.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.45 : 1,349.62 = 406.20 : x
  2. Step 2: Convert to fraction form
    899.45/1,349.62 = 406.20/x
  3. Step 3: Cross multiply
    899.45x = 1,349.62 × 406.20
  4. Step 4: Simplify right side
    899.45x = 548,215.64
  5. Step 5: Solve for x
    x = 548,215.64/899.45
  6. Step 6: Final answer
    x = 609.50

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1.5x scale

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.