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Finding the Fourth Proportional to 1,378.68, 2,068.47 and 556.53

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Solution

The fourth proportional to 1,378.68, 2,068.47 and 556.53 is: 834.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.68 : 2,068.47 = 556.53 : x
  2. Step 2: Convert to fraction form
    1,378.68/2,068.47 = 556.53/x
  3. Step 3: Cross multiply
    1,378.68x = 2,068.47 × 556.53
  4. Step 4: Simplify right side
    1,378.68x = 1,151,165.61
  5. Step 5: Solve for x
    x = 1,151,165.61/1,378.68
  6. Step 6: Final answer
    x = 834.98

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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.