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Finding the Fourth Proportional to 699.04, 964.80 and 640.48

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Solution

The fourth proportional to 699.04, 964.80 and 640.48 is: 883.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.04 : 964.80 = 640.48 : x
  2. Step 2: Convert to fraction form
    699.04/964.80 = 640.48/x
  3. Step 3: Cross multiply
    699.04x = 964.80 × 640.48
  4. Step 4: Simplify right side
    699.04x = 617,935.10
  5. Step 5: Solve for x
    x = 617,935.10/699.04
  6. Step 6: Final answer
    x = 883.98

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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.