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Finding the Fourth Proportional to 3,138.08, 4,707.12 and 946.88

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Solution

The fourth proportional to 3,138.08, 4,707.12 and 946.88 is: 1,420.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.08 : 4,707.12 = 946.88 : x
  2. Step 2: Convert to fraction form
    3,138.08/4,707.12 = 946.88/x
  3. Step 3: Cross multiply
    3,138.08x = 4,707.12 × 946.88
  4. Step 4: Simplify right side
    3,138.08x = 4,457,077.79
  5. Step 5: Solve for x
    x = 4,457,077.79/3,138.08
  6. Step 6: Final answer
    x = 1,420.32

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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.