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Finding the Fourth Proportional to 690.57, 1,034.91 and 320.16

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Solution

The fourth proportional to 690.57, 1,034.91 and 320.16 is: 479.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.57 : 1,034.91 = 320.16 : x
  2. Step 2: Convert to fraction form
    690.57/1,034.91 = 320.16/x
  3. Step 3: Cross multiply
    690.57x = 1,034.91 × 320.16
  4. Step 4: Simplify right side
    690.57x = 331,336.79
  5. Step 5: Solve for x
    x = 331,336.79/690.57
  6. Step 6: Final answer
    x = 479.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.