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Finding the Fourth Proportional to 698.95, 964.65 and 404.31

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Solution

The fourth proportional to 698.95, 964.65 and 404.31 is: 558.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.95 : 964.65 = 404.31 : x
  2. Step 2: Convert to fraction form
    698.95/964.65 = 404.31/x
  3. Step 3: Cross multiply
    698.95x = 964.65 × 404.31
  4. Step 4: Simplify right side
    698.95x = 390,017.64
  5. Step 5: Solve for x
    x = 390,017.64/698.95
  6. Step 6: Final answer
    x = 558.01

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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.