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Finding the Fourth Proportional to 1,035.72, 1,551.60 and 515.10

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Solution

The fourth proportional to 1,035.72, 1,551.60 and 515.10 is: 771.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.72 : 1,551.60 = 515.10 : x
  2. Step 2: Convert to fraction form
    1,035.72/1,551.60 = 515.10/x
  3. Step 3: Cross multiply
    1,035.72x = 1,551.60 × 515.10
  4. Step 4: Simplify right side
    1,035.72x = 799,229.16
  5. Step 5: Solve for x
    x = 799,229.16/1,035.72
  6. Step 6: Final answer
    x = 771.67

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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.