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Finding the Fourth Proportional to 700.80, 966.78 and 644.64

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Solution

The fourth proportional to 700.80, 966.78 and 644.64 is: 889.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.80 : 966.78 = 644.64 : x
  2. Step 2: Convert to fraction form
    700.80/966.78 = 644.64/x
  3. Step 3: Cross multiply
    700.80x = 966.78 × 644.64
  4. Step 4: Simplify right side
    700.80x = 623,225.06
  5. Step 5: Solve for x
    x = 623,225.06/700.80
  6. Step 6: Final answer
    x = 889.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.