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Finding the Fourth Proportional to 840.96, 1,259.61 and 515.34

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Solution

The fourth proportional to 840.96, 1,259.61 and 515.34 is: 771.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.96 : 1,259.61 = 515.34 : x
  2. Step 2: Convert to fraction form
    840.96/1,259.61 = 515.34/x
  3. Step 3: Cross multiply
    840.96x = 1,259.61 × 515.34
  4. Step 4: Simplify right side
    840.96x = 649,127.42
  5. Step 5: Solve for x
    x = 649,127.42/840.96
  6. Step 6: Final answer
    x = 771.89

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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.