Home / 1,186.31-1,631.64-1,038.69

Finding the Fourth Proportional to 1,186.31, 1,631.64 and 1,038.69

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Solution

The fourth proportional to 1,186.31, 1,631.64 and 1,038.69 is: 1,428.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.31 : 1,631.64 = 1,038.69 : x
  2. Step 2: Convert to fraction form
    1,186.31/1,631.64 = 1,038.69/x
  3. Step 3: Cross multiply
    1,186.31x = 1,631.64 × 1,038.69
  4. Step 4: Simplify right side
    1,186.31x = 1,694,772.05
  5. Step 5: Solve for x
    x = 1,694,772.05/1,186.31
  6. Step 6: Final answer
    x = 1,428.61

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1.5x scale

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.