Home / 1,689.12-2,330.37-990.36

Finding the Fourth Proportional to 1,689.12, 2,330.37 and 990.36

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Solution

The fourth proportional to 1,689.12, 2,330.37 and 990.36 is: 1,366.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.12 : 2,330.37 = 990.36 : x
  2. Step 2: Convert to fraction form
    1,689.12/2,330.37 = 990.36/x
  3. Step 3: Cross multiply
    1,689.12x = 2,330.37 × 990.36
  4. Step 4: Simplify right side
    1,689.12x = 2,307,905.23
  5. Step 5: Solve for x
    x = 2,307,905.23/1,689.12
  6. Step 6: Final answer
    x = 1,366.34

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Half scale
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Double scale
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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.