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Finding the Fourth Proportional to 1,411.63, 2,117.44 and 385.63

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Solution

The fourth proportional to 1,411.63, 2,117.44 and 385.63 is: 578.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.63 : 2,117.44 = 385.63 : x
  2. Step 2: Convert to fraction form
    1,411.63/2,117.44 = 385.63/x
  3. Step 3: Cross multiply
    1,411.63x = 2,117.44 × 385.63
  4. Step 4: Simplify right side
    1,411.63x = 816,548.39
  5. Step 5: Solve for x
    x = 816,548.39/1,411.63
  6. Step 6: Final answer
    x = 578.44

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Double scale
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Similar ratio
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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.