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Finding the Fourth Proportional to 686.81, 1,030.23 and 302.06

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Solution

The fourth proportional to 686.81, 1,030.23 and 302.06 is: 453.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.81 : 1,030.23 = 302.06 : x
  2. Step 2: Convert to fraction form
    686.81/1,030.23 = 302.06/x
  3. Step 3: Cross multiply
    686.81x = 1,030.23 × 302.06
  4. Step 4: Simplify right side
    686.81x = 311,193.85
  5. Step 5: Solve for x
    x = 311,193.85/686.81
  6. Step 6: Final answer
    x = 453.10

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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.