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Finding the Fourth Proportional to 1,037.60, 1,431.60 and 687.68

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Solution

The fourth proportional to 1,037.60, 1,431.60 and 687.68 is: 948.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.60 : 1,431.60 = 687.68 : x
  2. Step 2: Convert to fraction form
    1,037.60/1,431.60 = 687.68/x
  3. Step 3: Cross multiply
    1,037.60x = 1,431.60 × 687.68
  4. Step 4: Simplify right side
    1,037.60x = 984,482.69
  5. Step 5: Solve for x
    x = 984,482.69/1,037.60
  6. Step 6: Final answer
    x = 948.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.