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Finding the Fourth Proportional to 698.50, 964 and 403.74

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Solution

The fourth proportional to 698.50, 964 and 403.74 is: 557.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.50 : 964 = 403.74 : x
  2. Step 2: Convert to fraction form
    698.50/964 = 403.74/x
  3. Step 3: Cross multiply
    698.50x = 964 × 403.74
  4. Step 4: Simplify right side
    698.50x = 389,205.36
  5. Step 5: Solve for x
    x = 389,205.36/698.50
  6. Step 6: Final answer
    x = 557.20

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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.