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Finding the Fourth Proportional to 657.06, 986.40 and 611.70

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Solution

The fourth proportional to 657.06, 986.40 and 611.70 is: 918.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.06 : 986.40 = 611.70 : x
  2. Step 2: Convert to fraction form
    657.06/986.40 = 611.70/x
  3. Step 3: Cross multiply
    657.06x = 986.40 × 611.70
  4. Step 4: Simplify right side
    657.06x = 603,380.88
  5. Step 5: Solve for x
    x = 603,380.88/657.06
  6. Step 6: Final answer
    x = 918.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.