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Finding the Fourth Proportional to 1,021.17, 1,407.58 and 689.02

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Solution

The fourth proportional to 1,021.17, 1,407.58 and 689.02 is: 949.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.17 : 1,407.58 = 689.02 : x
  2. Step 2: Convert to fraction form
    1,021.17/1,407.58 = 689.02/x
  3. Step 3: Cross multiply
    1,021.17x = 1,407.58 × 689.02
  4. Step 4: Simplify right side
    1,021.17x = 969,850.77
  5. Step 5: Solve for x
    x = 969,850.77/1,021.17
  6. Step 6: Final answer
    x = 949.74

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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.