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Finding the Fourth Proportional to 618.20, 867.10 and 618.20

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Solution

The fourth proportional to 618.20, 867.10 and 618.20 is: 867.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.20 : 867.10 = 618.20 : x
  2. Step 2: Convert to fraction form
    618.20/867.10 = 618.20/x
  3. Step 3: Cross multiply
    618.20x = 867.10 × 618.20
  4. Step 4: Simplify right side
    618.20x = 536,041.22
  5. Step 5: Solve for x
    x = 536,041.22/618.20
  6. Step 6: Final answer
    x = 867.10

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Double scale
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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.