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Finding the Fourth Proportional to 628.20, 880.20 and 628.20

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Solution

The fourth proportional to 628.20, 880.20 and 628.20 is: 880.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.20 : 880.20 = 628.20 : x
  2. Step 2: Convert to fraction form
    628.20/880.20 = 628.20/x
  3. Step 3: Cross multiply
    628.20x = 880.20 × 628.20
  4. Step 4: Simplify right side
    628.20x = 552,941.64
  5. Step 5: Solve for x
    x = 552,941.64/628.20
  6. Step 6: Final answer
    x = 880.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.