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Finding the Fourth Proportional to 2,175.92, 3,002.64 and 1,390.16

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Solution

The fourth proportional to 2,175.92, 3,002.64 and 1,390.16 is: 1,918.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,175.92 : 3,002.64 = 1,390.16 : x
  2. Step 2: Convert to fraction form
    2,175.92/3,002.64 = 1,390.16/x
  3. Step 3: Cross multiply
    2,175.92x = 3,002.64 × 1,390.16
  4. Step 4: Simplify right side
    2,175.92x = 4,174,150.02
  5. Step 5: Solve for x
    x = 4,174,150.02/2,175.92
  6. Step 6: Final answer
    x = 1,918.34

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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.