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Finding the Fourth Proportional to 696.74, 1,045.14 and 390.55

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Solution

The fourth proportional to 696.74, 1,045.14 and 390.55 is: 585.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.74 : 1,045.14 = 390.55 : x
  2. Step 2: Convert to fraction form
    696.74/1,045.14 = 390.55/x
  3. Step 3: Cross multiply
    696.74x = 1,045.14 × 390.55
  4. Step 4: Simplify right side
    696.74x = 408,178.28
  5. Step 5: Solve for x
    x = 408,178.28/696.74
  6. Step 6: Final answer
    x = 585.84

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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.