Home / 13,130.51-18,120.11-7,162.20

Finding the Fourth Proportional to 13,130.51, 18,120.11 and 7,162.20

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Solution

The fourth proportional to 13,130.51, 18,120.11 and 7,162.20 is: 9,883.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,130.51 : 18,120.11 = 7,162.20 : x
  2. Step 2: Convert to fraction form
    13,130.51/18,120.11 = 7,162.20/x
  3. Step 3: Cross multiply
    13,130.51x = 18,120.11 × 7,162.20
  4. Step 4: Simplify right side
    13,130.51x = 129,779,816.03
  5. Step 5: Solve for x
    x = 129,779,816.03/13,130.51
  6. Step 6: Final answer
    x = 9,883.84

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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.