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Finding the Fourth Proportional to 694.51, 1,041.60 and 420.23

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Solution

The fourth proportional to 694.51, 1,041.60 and 420.23 is: 630.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.51 : 1,041.60 = 420.23 : x
  2. Step 2: Convert to fraction form
    694.51/1,041.60 = 420.23/x
  3. Step 3: Cross multiply
    694.51x = 1,041.60 × 420.23
  4. Step 4: Simplify right side
    694.51x = 437,711.57
  5. Step 5: Solve for x
    x = 437,711.57/694.51
  6. Step 6: Final answer
    x = 630.25

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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.