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Finding the Fourth Proportional to 694.84, 1,041.74 and 420.86

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Solution

The fourth proportional to 694.84, 1,041.74 and 420.86 is: 630.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.84 : 1,041.74 = 420.86 : x
  2. Step 2: Convert to fraction form
    694.84/1,041.74 = 420.86/x
  3. Step 3: Cross multiply
    694.84x = 1,041.74 × 420.86
  4. Step 4: Simplify right side
    694.84x = 438,424.59
  5. Step 5: Solve for x
    x = 438,424.59/694.84
  6. Step 6: Final answer
    x = 630.98

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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.