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Finding the Fourth Proportional to 1,689.02, 2,330.34 and 990.26

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Solution

The fourth proportional to 1,689.02, 2,330.34 and 990.26 is: 1,366.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.02 : 2,330.34 = 990.26 : x
  2. Step 2: Convert to fraction form
    1,689.02/2,330.34 = 990.26/x
  3. Step 3: Cross multiply
    1,689.02x = 2,330.34 × 990.26
  4. Step 4: Simplify right side
    1,689.02x = 2,307,642.49
  5. Step 5: Solve for x
    x = 2,307,642.49/1,689.02
  6. Step 6: Final answer
    x = 1,366.26

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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.