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Finding the Fourth Proportional to 987.06, 1,362.21 and 573.06

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Solution

The fourth proportional to 987.06, 1,362.21 and 573.06 is: 790.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.06 : 1,362.21 = 573.06 : x
  2. Step 2: Convert to fraction form
    987.06/1,362.21 = 573.06/x
  3. Step 3: Cross multiply
    987.06x = 1,362.21 × 573.06
  4. Step 4: Simplify right side
    987.06x = 780,628.06
  5. Step 5: Solve for x
    x = 780,628.06/987.06
  6. Step 6: Final answer
    x = 790.86

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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.