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Finding the Fourth Proportional to 1,041.05, 1,561.80 and 391.79

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Solution

The fourth proportional to 1,041.05, 1,561.80 and 391.79 is: 587.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.05 : 1,561.80 = 391.79 : x
  2. Step 2: Convert to fraction form
    1,041.05/1,561.80 = 391.79/x
  3. Step 3: Cross multiply
    1,041.05x = 1,561.80 × 391.79
  4. Step 4: Simplify right side
    1,041.05x = 611,889.81
  5. Step 5: Solve for x
    x = 611,889.81/1,041.05
  6. Step 6: Final answer
    x = 587.76

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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.