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Finding the Fourth Proportional to 2,145, 2,960.28 and 1,358.76

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Solution

The fourth proportional to 2,145, 2,960.28 and 1,358.76 is: 1,875.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145 : 2,960.28 = 1,358.76 : x
  2. Step 2: Convert to fraction form
    2,145/2,960.28 = 1,358.76/x
  3. Step 3: Cross multiply
    2,145x = 2,960.28 × 1,358.76
  4. Step 4: Simplify right side
    2,145x = 4,022,310.05
  5. Step 5: Solve for x
    x = 4,022,310.05/2,145
  6. Step 6: Final answer
    x = 1,875.20

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Half scale
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Double 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.