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Finding the Fourth Proportional to 910.43, 1,365.81 and 520.87

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Solution

The fourth proportional to 910.43, 1,365.81 and 520.87 is: 781.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.43 : 1,365.81 = 520.87 : x
  2. Step 2: Convert to fraction form
    910.43/1,365.81 = 520.87/x
  3. Step 3: Cross multiply
    910.43x = 1,365.81 × 520.87
  4. Step 4: Simplify right side
    910.43x = 711,409.45
  5. Step 5: Solve for x
    x = 711,409.45/910.43
  6. Step 6: Final answer
    x = 781.40

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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.