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Finding the Fourth Proportional to 1,364.88, 2,047.66 and 391

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Solution

The fourth proportional to 1,364.88, 2,047.66 and 391 is: 586.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364.88 : 2,047.66 = 391 : x
  2. Step 2: Convert to fraction form
    1,364.88/2,047.66 = 391/x
  3. Step 3: Cross multiply
    1,364.88x = 2,047.66 × 391
  4. Step 4: Simplify right side
    1,364.88x = 800,635.06
  5. Step 5: Solve for x
    x = 800,635.06/1,364.88
  6. Step 6: Final answer
    x = 586.60

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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.