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Finding the Fourth Proportional to 696.80, 1,045.51 and 372.09

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Solution

The fourth proportional to 696.80, 1,045.51 and 372.09 is: 558.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.80 : 1,045.51 = 372.09 : x
  2. Step 2: Convert to fraction form
    696.80/1,045.51 = 372.09/x
  3. Step 3: Cross multiply
    696.80x = 1,045.51 × 372.09
  4. Step 4: Simplify right side
    696.80x = 389,026.81
  5. Step 5: Solve for x
    x = 389,026.81/696.80
  6. Step 6: Final answer
    x = 558.30

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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.