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Finding the Fourth Proportional to 3,125.64, 4,313.40 and 1,728.40

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Solution

The fourth proportional to 3,125.64, 4,313.40 and 1,728.40 is: 2,385.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,125.64 : 4,313.40 = 1,728.40 : x
  2. Step 2: Convert to fraction form
    3,125.64/4,313.40 = 1,728.40/x
  3. Step 3: Cross multiply
    3,125.64x = 4,313.40 × 1,728.40
  4. Step 4: Simplify right side
    3,125.64x = 7,455,280.56
  5. Step 5: Solve for x
    x = 7,455,280.56/3,125.64
  6. Step 6: Final answer
    x = 2,385.20

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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.