Home / 20,999.64-31,421.70-15,457.08

Finding the Fourth Proportional to 20,999.64, 31,421.70 and 15,457.08

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Solution

The fourth proportional to 20,999.64, 31,421.70 and 15,457.08 is: 23,128.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.64 : 31,421.70 = 15,457.08 : x
  2. Step 2: Convert to fraction form
    20,999.64/31,421.70 = 15,457.08/x
  3. Step 3: Cross multiply
    20,999.64x = 31,421.70 × 15,457.08
  4. Step 4: Simplify right side
    20,999.64x = 485,687,730.64
  5. Step 5: Solve for x
    x = 485,687,730.64/20,999.64
  6. Step 6: Final answer
    x = 23,128.38

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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.