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Finding the Fourth Proportional to 699.18, 964.78 and 404.40

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Solution

The fourth proportional to 699.18, 964.78 and 404.40 is: 558.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.18 : 964.78 = 404.40 : x
  2. Step 2: Convert to fraction form
    699.18/964.78 = 404.40/x
  3. Step 3: Cross multiply
    699.18x = 964.78 × 404.40
  4. Step 4: Simplify right side
    699.18x = 390,157.03
  5. Step 5: Solve for x
    x = 390,157.03/699.18
  6. Step 6: Final answer
    x = 558.02

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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.