Home / 1,688.26-2,329.80-990.04

Finding the Fourth Proportional to 1,688.26, 2,329.80 and 990.04

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Solution

The fourth proportional to 1,688.26, 2,329.80 and 990.04 is: 1,366.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.26 : 2,329.80 = 990.04 : x
  2. Step 2: Convert to fraction form
    1,688.26/2,329.80 = 990.04/x
  3. Step 3: Cross multiply
    1,688.26x = 2,329.80 × 990.04
  4. Step 4: Simplify right side
    1,688.26x = 2,306,595.19
  5. Step 5: Solve for x
    x = 2,306,595.19/1,688.26
  6. Step 6: Final answer
    x = 1,366.26

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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.