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Finding the Fourth Proportional to 687.58, 1,030.66 and 394.77

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Solution

The fourth proportional to 687.58, 1,030.66 and 394.77 is: 591.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.58 : 1,030.66 = 394.77 : x
  2. Step 2: Convert to fraction form
    687.58/1,030.66 = 394.77/x
  3. Step 3: Cross multiply
    687.58x = 1,030.66 × 394.77
  4. Step 4: Simplify right side
    687.58x = 406,873.65
  5. Step 5: Solve for x
    x = 406,873.65/687.58
  6. Step 6: Final answer
    x = 591.75

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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.