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Finding the Fourth Proportional to 693.85, 1,035.77 and 643.18

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Solution

The fourth proportional to 693.85, 1,035.77 and 643.18 is: 960.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.85 : 1,035.77 = 643.18 : x
  2. Step 2: Convert to fraction form
    693.85/1,035.77 = 643.18/x
  3. Step 3: Cross multiply
    693.85x = 1,035.77 × 643.18
  4. Step 4: Simplify right side
    693.85x = 666,184.94
  5. Step 5: Solve for x
    x = 666,184.94/693.85
  6. Step 6: Final answer
    x = 960.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.