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Finding the Fourth Proportional to 1,443.75, 2,165.63 and 417.75

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Solution

The fourth proportional to 1,443.75, 2,165.63 and 417.75 is: 626.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,443.75 : 2,165.63 = 417.75 : x
  2. Step 2: Convert to fraction form
    1,443.75/2,165.63 = 417.75/x
  3. Step 3: Cross multiply
    1,443.75x = 2,165.63 × 417.75
  4. Step 4: Simplify right side
    1,443.75x = 904,689.84
  5. Step 5: Solve for x
    x = 904,689.84/1,443.75
  6. Step 6: Final answer
    x = 626.63

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Double scale
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1.5x scale

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.