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Finding the Fourth Proportional to 988.67, 1,476 and 879.32

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Solution

The fourth proportional to 988.67, 1,476 and 879.32 is: 1,312.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.67 : 1,476 = 879.32 : x
  2. Step 2: Convert to fraction form
    988.67/1,476 = 879.32/x
  3. Step 3: Cross multiply
    988.67x = 1,476 × 879.32
  4. Step 4: Simplify right side
    988.67x = 1,297,880.01
  5. Step 5: Solve for x
    x = 1,297,880.01/988.67
  6. Step 6: Final answer
    x = 1,312.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.