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Finding the Fourth Proportional to 1,561.70, 2,341.76 and 521.33

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Solution

The fourth proportional to 1,561.70, 2,341.76 and 521.33 is: 781.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.70 : 2,341.76 = 521.33 : x
  2. Step 2: Convert to fraction form
    1,561.70/2,341.76 = 521.33/x
  3. Step 3: Cross multiply
    1,561.70x = 2,341.76 × 521.33
  4. Step 4: Simplify right side
    1,561.70x = 1,220,830.06
  5. Step 5: Solve for x
    x = 1,220,830.06/1,561.70
  6. Step 6: Final answer
    x = 781.73

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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.