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Finding the Fourth Proportional to 687.12, 1,030.76 and 412.84

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Solution

The fourth proportional to 687.12, 1,030.76 and 412.84 is: 619.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.12 : 1,030.76 = 412.84 : x
  2. Step 2: Convert to fraction form
    687.12/1,030.76 = 412.84/x
  3. Step 3: Cross multiply
    687.12x = 1,030.76 × 412.84
  4. Step 4: Simplify right side
    687.12x = 425,538.96
  5. Step 5: Solve for x
    x = 425,538.96/687.12
  6. Step 6: Final answer
    x = 619.31

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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.