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Finding the Fourth Proportional to 1,378.61, 2,068.06 and 556.75

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Solution

The fourth proportional to 1,378.61, 2,068.06 and 556.75 is: 835.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.61 : 2,068.06 = 556.75 : x
  2. Step 2: Convert to fraction form
    1,378.61/2,068.06 = 556.75/x
  3. Step 3: Cross multiply
    1,378.61x = 2,068.06 × 556.75
  4. Step 4: Simplify right side
    1,378.61x = 1,151,392.41
  5. Step 5: Solve for x
    x = 1,151,392.41/1,378.61
  6. Step 6: Final answer
    x = 835.18

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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.