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Finding the Fourth Proportional to 1,144.74, 1,579.66 and 647.40

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Solution

The fourth proportional to 1,144.74, 1,579.66 and 647.40 is: 893.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.74 : 1,579.66 = 647.40 : x
  2. Step 2: Convert to fraction form
    1,144.74/1,579.66 = 647.40/x
  3. Step 3: Cross multiply
    1,144.74x = 1,579.66 × 647.40
  4. Step 4: Simplify right side
    1,144.74x = 1,022,671.88
  5. Step 5: Solve for x
    x = 1,022,671.88/1,144.74
  6. Step 6: Final answer
    x = 893.37

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Half scale
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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.