Home / 21,276.79-31,904.46-12,395.05

Finding the Fourth Proportional to 21,276.79, 31,904.46 and 12,395.05

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Solution

The fourth proportional to 21,276.79, 31,904.46 and 12,395.05 is: 18,586.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276.79 : 31,904.46 = 12,395.05 : x
  2. Step 2: Convert to fraction form
    21,276.79/31,904.46 = 12,395.05/x
  3. Step 3: Cross multiply
    21,276.79x = 31,904.46 × 12,395.05
  4. Step 4: Simplify right side
    21,276.79x = 395,457,376.92
  5. Step 5: Solve for x
    x = 395,457,376.92/21,276.79
  6. Step 6: Final answer
    x = 18,586.33

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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.