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Finding the Fourth Proportional to 988.55, 1,364.18 and 639.24

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Solution

The fourth proportional to 988.55, 1,364.18 and 639.24 is: 882.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.55 : 1,364.18 = 639.24 : x
  2. Step 2: Convert to fraction form
    988.55/1,364.18 = 639.24/x
  3. Step 3: Cross multiply
    988.55x = 1,364.18 × 639.24
  4. Step 4: Simplify right side
    988.55x = 872,035.23
  5. Step 5: Solve for x
    x = 872,035.23/988.55
  6. Step 6: Final answer
    x = 882.14

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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.