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Finding the Fourth Proportional to 1,041.03, 1,561.28 and 391.95

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Solution

The fourth proportional to 1,041.03, 1,561.28 and 391.95 is: 587.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.03 : 1,561.28 = 391.95 : x
  2. Step 2: Convert to fraction form
    1,041.03/1,561.28 = 391.95/x
  3. Step 3: Cross multiply
    1,041.03x = 1,561.28 × 391.95
  4. Step 4: Simplify right side
    1,041.03x = 611,941.74
  5. Step 5: Solve for x
    x = 611,941.74/1,041.03
  6. Step 6: Final answer
    x = 587.82

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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.