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Finding the Fourth Proportional to 987.16, 1,361.98 and 573.08

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Solution

The fourth proportional to 987.16, 1,361.98 and 573.08 is: 790.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.16 : 1,361.98 = 573.08 : x
  2. Step 2: Convert to fraction form
    987.16/1,361.98 = 573.08/x
  3. Step 3: Cross multiply
    987.16x = 1,361.98 × 573.08
  4. Step 4: Simplify right side
    987.16x = 780,523.50
  5. Step 5: Solve for x
    x = 780,523.50/987.16
  6. Step 6: Final answer
    x = 790.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.