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Finding the Fourth Proportional to 666.87, 995.40 and 618

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Solution

The fourth proportional to 666.87, 995.40 and 618 is: 922.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.87 : 995.40 = 618 : x
  2. Step 2: Convert to fraction form
    666.87/995.40 = 618/x
  3. Step 3: Cross multiply
    666.87x = 995.40 × 618
  4. Step 4: Simplify right side
    666.87x = 615,157.20
  5. Step 5: Solve for x
    x = 615,157.20/666.87
  6. Step 6: Final answer
    x = 922.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.