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Finding the Fourth Proportional to 942.80, 1,308.38 and 904.40

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Solution

The fourth proportional to 942.80, 1,308.38 and 904.40 is: 1,255.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.80 : 1,308.38 = 904.40 : x
  2. Step 2: Convert to fraction form
    942.80/1,308.38 = 904.40/x
  3. Step 3: Cross multiply
    942.80x = 1,308.38 × 904.40
  4. Step 4: Simplify right side
    942.80x = 1,183,298.87
  5. Step 5: Solve for x
    x = 1,183,298.87/942.80
  6. Step 6: Final answer
    x = 1,255.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.