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Finding the Fourth Proportional to 691.76, 1,035.21 and 528.14

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Solution

The fourth proportional to 691.76, 1,035.21 and 528.14 is: 790.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.76 : 1,035.21 = 528.14 : x
  2. Step 2: Convert to fraction form
    691.76/1,035.21 = 528.14/x
  3. Step 3: Cross multiply
    691.76x = 1,035.21 × 528.14
  4. Step 4: Simplify right side
    691.76x = 546,735.81
  5. Step 5: Solve for x
    x = 546,735.81/691.76
  6. Step 6: Final answer
    x = 790.35

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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.