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Finding the Fourth Proportional to 987.03, 1,362.20 and 609.12

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Solution

The fourth proportional to 987.03, 1,362.20 and 609.12 is: 840.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.03 : 1,362.20 = 609.12 : x
  2. Step 2: Convert to fraction form
    987.03/1,362.20 = 609.12/x
  3. Step 3: Cross multiply
    987.03x = 1,362.20 × 609.12
  4. Step 4: Simplify right side
    987.03x = 829,740.22
  5. Step 5: Solve for x
    x = 829,740.22/987.03
  6. Step 6: Final answer
    x = 840.64

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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.