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Finding the Fourth Proportional to 987.60, 1,362.08 and 722.04

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Solution

The fourth proportional to 987.60, 1,362.08 and 722.04 is: 995.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.60 : 1,362.08 = 722.04 : x
  2. Step 2: Convert to fraction form
    987.60/1,362.08 = 722.04/x
  3. Step 3: Cross multiply
    987.60x = 1,362.08 × 722.04
  4. Step 4: Simplify right side
    987.60x = 983,476.24
  5. Step 5: Solve for x
    x = 983,476.24/987.60
  6. Step 6: Final answer
    x = 995.82

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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.