Home / 20,905.84-31,307.63-18,881.78

Finding the Fourth Proportional to 20,905.84, 31,307.63 and 18,881.78

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Solution

The fourth proportional to 20,905.84, 31,307.63 and 18,881.78 is: 28,276.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.84 : 31,307.63 = 18,881.78 : x
  2. Step 2: Convert to fraction form
    20,905.84/31,307.63 = 18,881.78/x
  3. Step 3: Cross multiply
    20,905.84x = 31,307.63 × 18,881.78
  4. Step 4: Simplify right side
    20,905.84x = 591,143,765.84
  5. Step 5: Solve for x
    x = 591,143,765.84/20,905.84
  6. Step 6: Final answer
    x = 28,276.49

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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.