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Finding the Fourth Proportional to 5,612.40, 7,744.80 and 3,128.40

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Solution

The fourth proportional to 5,612.40, 7,744.80 and 3,128.40 is: 4,317.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,612.40 : 7,744.80 = 3,128.40 : x
  2. Step 2: Convert to fraction form
    5,612.40/7,744.80 = 3,128.40/x
  3. Step 3: Cross multiply
    5,612.40x = 7,744.80 × 3,128.40
  4. Step 4: Simplify right side
    5,612.40x = 24,228,832.32
  5. Step 5: Solve for x
    x = 24,228,832.32/5,612.40
  6. Step 6: Final answer
    x = 4,317.02

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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.