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Finding the Fourth Proportional to 690.68, 1,036.08 and 447.68

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Solution

The fourth proportional to 690.68, 1,036.08 and 447.68 is: 671.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.68 : 1,036.08 = 447.68 : x
  2. Step 2: Convert to fraction form
    690.68/1,036.08 = 447.68/x
  3. Step 3: Cross multiply
    690.68x = 1,036.08 × 447.68
  4. Step 4: Simplify right side
    690.68x = 463,827.11
  5. Step 5: Solve for x
    x = 463,827.11/690.68
  6. Step 6: Final answer
    x = 671.56

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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.