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Finding the Fourth Proportional to 1,378.99, 2,068.61 and 442.07

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Solution

The fourth proportional to 1,378.99, 2,068.61 and 442.07 is: 663.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.99 : 2,068.61 = 442.07 : x
  2. Step 2: Convert to fraction form
    1,378.99/2,068.61 = 442.07/x
  3. Step 3: Cross multiply
    1,378.99x = 2,068.61 × 442.07
  4. Step 4: Simplify right side
    1,378.99x = 914,470.42
  5. Step 5: Solve for x
    x = 914,470.42/1,378.99
  6. Step 6: Final answer
    x = 663.15

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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.