Home / 20,703.89-31,015.73-12,390.45

Finding the Fourth Proportional to 20,703.89, 31,015.73 and 12,390.45

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Solution

The fourth proportional to 20,703.89, 31,015.73 and 12,390.45 is: 18,561.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,703.89 : 31,015.73 = 12,390.45 : x
  2. Step 2: Convert to fraction form
    20,703.89/31,015.73 = 12,390.45/x
  3. Step 3: Cross multiply
    20,703.89x = 31,015.73 × 12,390.45
  4. Step 4: Simplify right side
    20,703.89x = 384,298,851.78
  5. Step 5: Solve for x
    x = 384,298,851.78/20,703.89
  6. Step 6: Final answer
    x = 18,561.68

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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.