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Finding the Fourth Proportional to 653.55, 986.15 and 628.24

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Solution

The fourth proportional to 653.55, 986.15 and 628.24 is: 947.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.55 : 986.15 = 628.24 : x
  2. Step 2: Convert to fraction form
    653.55/986.15 = 628.24/x
  3. Step 3: Cross multiply
    653.55x = 986.15 × 628.24
  4. Step 4: Simplify right side
    653.55x = 619,530.80
  5. Step 5: Solve for x
    x = 619,530.80/653.55
  6. Step 6: Final answer
    x = 947.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.