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Finding the Fourth Proportional to 618.60, 868.20 and 618.60

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Solution

The fourth proportional to 618.60, 868.20 and 618.60 is: 868.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.60 : 868.20 = 618.60 : x
  2. Step 2: Convert to fraction form
    618.60/868.20 = 618.60/x
  3. Step 3: Cross multiply
    618.60x = 868.20 × 618.60
  4. Step 4: Simplify right side
    618.60x = 537,068.52
  5. Step 5: Solve for x
    x = 537,068.52/618.60
  6. Step 6: Final answer
    x = 868.20

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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.