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Finding the Fourth Proportional to 899.90, 1,349.50 and 380.15

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Solution

The fourth proportional to 899.90, 1,349.50 and 380.15 is: 570.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.90 : 1,349.50 = 380.15 : x
  2. Step 2: Convert to fraction form
    899.90/1,349.50 = 380.15/x
  3. Step 3: Cross multiply
    899.90x = 1,349.50 × 380.15
  4. Step 4: Simplify right side
    899.90x = 513,014.85
  5. Step 5: Solve for x
    x = 513,014.85/899.90
  6. Step 6: Final answer
    x = 570.08

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Double scale
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Similar ratio
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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.