Home / 13,779.05-18,981.34-9,991.08

Finding the Fourth Proportional to 13,779.05, 18,981.34 and 9,991.08

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Solution

The fourth proportional to 13,779.05, 18,981.34 and 9,991.08 is: 13,763.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,779.05 : 18,981.34 = 9,991.08 : x
  2. Step 2: Convert to fraction form
    13,779.05/18,981.34 = 9,991.08/x
  3. Step 3: Cross multiply
    13,779.05x = 18,981.34 × 9,991.08
  4. Step 4: Simplify right side
    13,779.05x = 189,644,061.47
  5. Step 5: Solve for x
    x = 189,644,061.47/13,779.05
  6. Step 6: Final answer
    x = 13,763.22

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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.