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Finding the Fourth Proportional to 987.10, 1,480.83 and 570.22

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Solution

The fourth proportional to 987.10, 1,480.83 and 570.22 is: 855.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.10 : 1,480.83 = 570.22 : x
  2. Step 2: Convert to fraction form
    987.10/1,480.83 = 570.22/x
  3. Step 3: Cross multiply
    987.10x = 1,480.83 × 570.22
  4. Step 4: Simplify right side
    987.10x = 844,398.88
  5. Step 5: Solve for x
    x = 844,398.88/987.10
  6. Step 6: Final answer
    x = 855.43

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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.