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Finding the Fourth Proportional to 689.99, 951.45 and 490.93

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Solution

The fourth proportional to 689.99, 951.45 and 490.93 is: 676.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.99 : 951.45 = 490.93 : x
  2. Step 2: Convert to fraction form
    689.99/951.45 = 490.93/x
  3. Step 3: Cross multiply
    689.99x = 951.45 × 490.93
  4. Step 4: Simplify right side
    689.99x = 467,091.13
  5. Step 5: Solve for x
    x = 467,091.13/689.99
  6. Step 6: Final answer
    x = 676.96

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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.