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Finding the Fourth Proportional to 1,145.15, 1,579.99 and 672.88

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Solution

The fourth proportional to 1,145.15, 1,579.99 and 672.88 is: 928.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.15 : 1,579.99 = 672.88 : x
  2. Step 2: Convert to fraction form
    1,145.15/1,579.99 = 672.88/x
  3. Step 3: Cross multiply
    1,145.15x = 1,579.99 × 672.88
  4. Step 4: Simplify right side
    1,145.15x = 1,063,136.18
  5. Step 5: Solve for x
    x = 1,063,136.18/1,145.15
  6. Step 6: Final answer
    x = 928.38

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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.