Home / 1,128.09-1,687.58-975.71

Finding the Fourth Proportional to 1,128.09, 1,687.58 and 975.71

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Solution

The fourth proportional to 1,128.09, 1,687.58 and 975.71 is: 1,459.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.09 : 1,687.58 = 975.71 : x
  2. Step 2: Convert to fraction form
    1,128.09/1,687.58 = 975.71/x
  3. Step 3: Cross multiply
    1,128.09x = 1,687.58 × 975.71
  4. Step 4: Simplify right side
    1,128.09x = 1,646,579.58
  5. Step 5: Solve for x
    x = 1,646,579.58/1,128.09
  6. Step 6: Final answer
    x = 1,459.62

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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.