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Finding the Fourth Proportional to 686.51, 1,030.33 and 404.81

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Solution

The fourth proportional to 686.51, 1,030.33 and 404.81 is: 607.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.51 : 1,030.33 = 404.81 : x
  2. Step 2: Convert to fraction form
    686.51/1,030.33 = 404.81/x
  3. Step 3: Cross multiply
    686.51x = 1,030.33 × 404.81
  4. Step 4: Simplify right side
    686.51x = 417,081.72
  5. Step 5: Solve for x
    x = 417,081.72/686.51
  6. Step 6: Final answer
    x = 607.54

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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.