Home / 9,161.87-12,642.31-5,128.91

Finding the Fourth Proportional to 9,161.87, 12,642.31 and 5,128.91

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Solution

The fourth proportional to 9,161.87, 12,642.31 and 5,128.91 is: 7,077.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,161.87 : 12,642.31 = 5,128.91 : x
  2. Step 2: Convert to fraction form
    9,161.87/12,642.31 = 5,128.91/x
  3. Step 3: Cross multiply
    9,161.87x = 12,642.31 × 5,128.91
  4. Step 4: Simplify right side
    9,161.87x = 64,841,303.05
  5. Step 5: Solve for x
    x = 64,841,303.05/9,161.87
  6. Step 6: Final answer
    x = 7,077.30

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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.