Home / 20,989.76-31,461.52-18,530.60

Finding the Fourth Proportional to 20,989.76, 31,461.52 and 18,530.60

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Solution

The fourth proportional to 20,989.76, 31,461.52 and 18,530.60 is: 27,775.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.76 : 31,461.52 = 18,530.60 : x
  2. Step 2: Convert to fraction form
    20,989.76/31,461.52 = 18,530.60/x
  3. Step 3: Cross multiply
    20,989.76x = 31,461.52 × 18,530.60
  4. Step 4: Simplify right side
    20,989.76x = 583,000,842.51
  5. Step 5: Solve for x
    x = 583,000,842.51/20,989.76
  6. Step 6: Final answer
    x = 27,775.49

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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.