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Finding the Fourth Proportional to 1,126.84, 1,689.10 and 433.32

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Solution

The fourth proportional to 1,126.84, 1,689.10 and 433.32 is: 649.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.84 : 1,689.10 = 433.32 : x
  2. Step 2: Convert to fraction form
    1,126.84/1,689.10 = 433.32/x
  3. Step 3: Cross multiply
    1,126.84x = 1,689.10 × 433.32
  4. Step 4: Simplify right side
    1,126.84x = 731,920.81
  5. Step 5: Solve for x
    x = 731,920.81/1,126.84
  6. Step 6: Final answer
    x = 649.54

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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.