Home / 30,889.96-42,663.16-20,800.85

Finding the Fourth Proportional to 30,889.96, 42,663.16 and 20,800.85

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Solution

The fourth proportional to 30,889.96, 42,663.16 and 20,800.85 is: 28,728.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,889.96 : 42,663.16 = 20,800.85 : x
  2. Step 2: Convert to fraction form
    30,889.96/42,663.16 = 20,800.85/x
  3. Step 3: Cross multiply
    30,889.96x = 42,663.16 × 20,800.85
  4. Step 4: Simplify right side
    30,889.96x = 887,429,927.35
  5. Step 5: Solve for x
    x = 887,429,927.35/30,889.96
  6. Step 6: Final answer
    x = 28,728.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.