Home / 13,778.17-18,980.13-9,990.21

Finding the Fourth Proportional to 13,778.17, 18,980.13 and 9,990.21

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Solution

The fourth proportional to 13,778.17, 18,980.13 and 9,990.21 is: 13,762.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,778.17 : 18,980.13 = 9,990.21 : x
  2. Step 2: Convert to fraction form
    13,778.17/18,980.13 = 9,990.21/x
  3. Step 3: Cross multiply
    13,778.17x = 18,980.13 × 9,990.21
  4. Step 4: Simplify right side
    13,778.17x = 189,615,389.63
  5. Step 5: Solve for x
    x = 189,615,389.63/13,778.17
  6. Step 6: Final answer
    x = 13,762.02

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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.