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Finding the Fourth Proportional to 690.99, 1,036.48 and 486.47

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Solution

The fourth proportional to 690.99, 1,036.48 and 486.47 is: 729.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.99 : 1,036.48 = 486.47 : x
  2. Step 2: Convert to fraction form
    690.99/1,036.48 = 486.47/x
  3. Step 3: Cross multiply
    690.99x = 1,036.48 × 486.47
  4. Step 4: Simplify right side
    690.99x = 504,216.43
  5. Step 5: Solve for x
    x = 504,216.43/690.99
  6. Step 6: Final answer
    x = 729.70

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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.