Home / 13,421.19-20,139.03-7,885.35

Finding the Fourth Proportional to 13,421.19, 20,139.03 and 7,885.35

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Solution

The fourth proportional to 13,421.19, 20,139.03 and 7,885.35 is: 11,832.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.19 : 20,139.03 = 7,885.35 : x
  2. Step 2: Convert to fraction form
    13,421.19/20,139.03 = 7,885.35/x
  3. Step 3: Cross multiply
    13,421.19x = 20,139.03 × 7,885.35
  4. Step 4: Simplify right side
    13,421.19x = 158,803,300.21
  5. Step 5: Solve for x
    x = 158,803,300.21/13,421.19
  6. Step 6: Final answer
    x = 11,832.28

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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.