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Finding the Fourth Proportional to 690.48, 1,036.13 and 325.06

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Solution

The fourth proportional to 690.48, 1,036.13 and 325.06 is: 487.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.48 : 1,036.13 = 325.06 : x
  2. Step 2: Convert to fraction form
    690.48/1,036.13 = 325.06/x
  3. Step 3: Cross multiply
    690.48x = 1,036.13 × 325.06
  4. Step 4: Simplify right side
    690.48x = 336,804.42
  5. Step 5: Solve for x
    x = 336,804.42/690.48
  6. Step 6: Final answer
    x = 487.78

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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.