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Finding the Fourth Proportional to 1,037.66, 1,555.81 and 388.02

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Solution

The fourth proportional to 1,037.66, 1,555.81 and 388.02 is: 581.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.66 : 1,555.81 = 388.02 : x
  2. Step 2: Convert to fraction form
    1,037.66/1,555.81 = 388.02/x
  3. Step 3: Cross multiply
    1,037.66x = 1,555.81 × 388.02
  4. Step 4: Simplify right side
    1,037.66x = 603,685.40
  5. Step 5: Solve for x
    x = 603,685.40/1,037.66
  6. Step 6: Final answer
    x = 581.78

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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.