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Finding the Fourth Proportional to 689.94, 1,034.19 and 455.40

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Solution

The fourth proportional to 689.94, 1,034.19 and 455.40 is: 682.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.94 : 1,034.19 = 455.40 : x
  2. Step 2: Convert to fraction form
    689.94/1,034.19 = 455.40/x
  3. Step 3: Cross multiply
    689.94x = 1,034.19 × 455.40
  4. Step 4: Simplify right side
    689.94x = 470,970.13
  5. Step 5: Solve for x
    x = 470,970.13/689.94
  6. Step 6: Final answer
    x = 682.62

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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.