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Finding the Fourth Proportional to 1,098.99, 1,646.86 and 611.91

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Solution

The fourth proportional to 1,098.99, 1,646.86 and 611.91 is: 916.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.99 : 1,646.86 = 611.91 : x
  2. Step 2: Convert to fraction form
    1,098.99/1,646.86 = 611.91/x
  3. Step 3: Cross multiply
    1,098.99x = 1,646.86 × 611.91
  4. Step 4: Simplify right side
    1,098.99x = 1,007,720.34
  5. Step 5: Solve for x
    x = 1,007,720.34/1,098.99
  6. Step 6: Final answer
    x = 916.96

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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.