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Finding the Fourth Proportional to 988.44, 1,482.89 and 440.78

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Solution

The fourth proportional to 988.44, 1,482.89 and 440.78 is: 661.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.44 : 1,482.89 = 440.78 : x
  2. Step 2: Convert to fraction form
    988.44/1,482.89 = 440.78/x
  3. Step 3: Cross multiply
    988.44x = 1,482.89 × 440.78
  4. Step 4: Simplify right side
    988.44x = 653,621.12
  5. Step 5: Solve for x
    x = 653,621.12/988.44
  6. Step 6: Final answer
    x = 661.27

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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.