Home / 13,779.17-18,981.51-9,991.21

Finding the Fourth Proportional to 13,779.17, 18,981.51 and 9,991.21

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Solution

The fourth proportional to 13,779.17, 18,981.51 and 9,991.21 is: 13,763.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,779.17 : 18,981.51 = 9,991.21 : x
  2. Step 2: Convert to fraction form
    13,779.17/18,981.51 = 9,991.21/x
  3. Step 3: Cross multiply
    13,779.17x = 18,981.51 × 9,991.21
  4. Step 4: Simplify right side
    13,779.17x = 189,648,252.53
  5. Step 5: Solve for x
    x = 189,648,252.53/13,779.17
  6. Step 6: Final answer
    x = 13,763.40

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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.