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Finding the Fourth Proportional to 1,216.40, 1,824.60 and 904.55

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Solution

The fourth proportional to 1,216.40, 1,824.60 and 904.55 is: 1,356.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.40 : 1,824.60 = 904.55 : x
  2. Step 2: Convert to fraction form
    1,216.40/1,824.60 = 904.55/x
  3. Step 3: Cross multiply
    1,216.40x = 1,824.60 × 904.55
  4. Step 4: Simplify right side
    1,216.40x = 1,650,441.93
  5. Step 5: Solve for x
    x = 1,650,441.93/1,216.40
  6. Step 6: Final answer
    x = 1,356.83

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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.