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Finding the Fourth Proportional to 937.80, 1,409.40 and 921.60

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Solution

The fourth proportional to 937.80, 1,409.40 and 921.60 is: 1,385.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.80 : 1,409.40 = 921.60 : x
  2. Step 2: Convert to fraction form
    937.80/1,409.40 = 921.60/x
  3. Step 3: Cross multiply
    937.80x = 1,409.40 × 921.60
  4. Step 4: Simplify right side
    937.80x = 1,298,903.04
  5. Step 5: Solve for x
    x = 1,298,903.04/937.80
  6. Step 6: Final answer
    x = 1,385.05

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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.