Home / 20,989.96-28,957.30-13,904.08

Finding the Fourth Proportional to 20,989.96, 28,957.30 and 13,904.08

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Solution

The fourth proportional to 20,989.96, 28,957.30 and 13,904.08 is: 19,181.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.96 : 28,957.30 = 13,904.08 : x
  2. Step 2: Convert to fraction form
    20,989.96/28,957.30 = 13,904.08/x
  3. Step 3: Cross multiply
    20,989.96x = 28,957.30 × 13,904.08
  4. Step 4: Simplify right side
    20,989.96x = 402,624,615.78
  5. Step 5: Solve for x
    x = 402,624,615.78/20,989.96
  6. Step 6: Final answer
    x = 19,181.77

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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.