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Finding the Fourth Proportional to 1,378.89, 2,068.62 and 454.50

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Solution

The fourth proportional to 1,378.89, 2,068.62 and 454.50 is: 681.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.89 : 2,068.62 = 454.50 : x
  2. Step 2: Convert to fraction form
    1,378.89/2,068.62 = 454.50/x
  3. Step 3: Cross multiply
    1,378.89x = 2,068.62 × 454.50
  4. Step 4: Simplify right side
    1,378.89x = 940,195.55
  5. Step 5: Solve for x
    x = 940,195.55/1,378.89
  6. Step 6: Final answer
    x = 681.85

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1.5x scale

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.