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Finding the Fourth Proportional to 661.28, 986.54 and 607.70

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Solution

The fourth proportional to 661.28, 986.54 and 607.70 is: 906.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.28 : 986.54 = 607.70 : x
  2. Step 2: Convert to fraction form
    661.28/986.54 = 607.70/x
  3. Step 3: Cross multiply
    661.28x = 986.54 × 607.70
  4. Step 4: Simplify right side
    661.28x = 599,519.79
  5. Step 5: Solve for x
    x = 599,519.79/661.28
  6. Step 6: Final answer
    x = 906.60

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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.