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Finding the Fourth Proportional to 987.55, 1,368.70 and 969.10

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Solution

The fourth proportional to 987.55, 1,368.70 and 969.10 is: 1,343.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.55 : 1,368.70 = 969.10 : x
  2. Step 2: Convert to fraction form
    987.55/1,368.70 = 969.10/x
  3. Step 3: Cross multiply
    987.55x = 1,368.70 × 969.10
  4. Step 4: Simplify right side
    987.55x = 1,326,400.33
  5. Step 5: Solve for x
    x = 1,326,400.33/987.55
  6. Step 6: Final answer
    x = 1,343.13

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.