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Finding the Fourth Proportional to 1,125.74, 1,688.79 and 509.42

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Solution

The fourth proportional to 1,125.74, 1,688.79 and 509.42 is: 764.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.74 : 1,688.79 = 509.42 : x
  2. Step 2: Convert to fraction form
    1,125.74/1,688.79 = 509.42/x
  3. Step 3: Cross multiply
    1,125.74x = 1,688.79 × 509.42
  4. Step 4: Simplify right side
    1,125.74x = 860,294.96
  5. Step 5: Solve for x
    x = 860,294.96/1,125.74
  6. Step 6: Final answer
    x = 764.21

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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.