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Finding the Fourth Proportional to 917.79, 1,374.24 and 527.21

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Solution

The fourth proportional to 917.79, 1,374.24 and 527.21 is: 789.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.79 : 1,374.24 = 527.21 : x
  2. Step 2: Convert to fraction form
    917.79/1,374.24 = 527.21/x
  3. Step 3: Cross multiply
    917.79x = 1,374.24 × 527.21
  4. Step 4: Simplify right side
    917.79x = 724,508.32
  5. Step 5: Solve for x
    x = 724,508.32/917.79
  6. Step 6: Final answer
    x = 789.40

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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.