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Finding the Fourth Proportional to 941.90, 1,412.78 and 509.05

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Solution

The fourth proportional to 941.90, 1,412.78 and 509.05 is: 763.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.90 : 1,412.78 = 509.05 : x
  2. Step 2: Convert to fraction form
    941.90/1,412.78 = 509.05/x
  3. Step 3: Cross multiply
    941.90x = 1,412.78 × 509.05
  4. Step 4: Simplify right side
    941.90x = 719,174.88
  5. Step 5: Solve for x
    x = 719,174.88/941.90
  6. Step 6: Final answer
    x = 763.54

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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.