Home / 5,120.87-7,064.65-3,130.79

Finding the Fourth Proportional to 5,120.87, 7,064.65 and 3,130.79

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Solution

The fourth proportional to 5,120.87, 7,064.65 and 3,130.79 is: 4,319.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.87 : 7,064.65 = 3,130.79 : x
  2. Step 2: Convert to fraction form
    5,120.87/7,064.65 = 3,130.79/x
  3. Step 3: Cross multiply
    5,120.87x = 7,064.65 × 3,130.79
  4. Step 4: Simplify right side
    5,120.87x = 22,117,935.57
  5. Step 5: Solve for x
    x = 22,117,935.57/5,120.87
  6. Step 6: Final answer
    x = 4,319.18

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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.