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Finding the Fourth Proportional to 1,041.70, 1,561.81 and 521.33

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Solution

The fourth proportional to 1,041.70, 1,561.81 and 521.33 is: 781.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.70 : 1,561.81 = 521.33 : x
  2. Step 2: Convert to fraction form
    1,041.70/1,561.81 = 521.33/x
  3. Step 3: Cross multiply
    1,041.70x = 1,561.81 × 521.33
  4. Step 4: Simplify right side
    1,041.70x = 814,216.50
  5. Step 5: Solve for x
    x = 814,216.50/1,041.70
  6. Step 6: Final answer
    x = 781.62

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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.