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Finding the Fourth Proportional to 917.43, 1,265.99 and 524.45

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Solution

The fourth proportional to 917.43, 1,265.99 and 524.45 is: 723.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.43 : 1,265.99 = 524.45 : x
  2. Step 2: Convert to fraction form
    917.43/1,265.99 = 524.45/x
  3. Step 3: Cross multiply
    917.43x = 1,265.99 × 524.45
  4. Step 4: Simplify right side
    917.43x = 663,939.50
  5. Step 5: Solve for x
    x = 663,939.50/917.43
  6. Step 6: Final answer
    x = 723.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.