Home / 30,939.15-42,730.83-20,909.01

Finding the Fourth Proportional to 30,939.15, 42,730.83 and 20,909.01

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Solution

The fourth proportional to 30,939.15, 42,730.83 and 20,909.01 is: 28,877.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.15 : 42,730.83 = 20,909.01 : x
  2. Step 2: Convert to fraction form
    30,939.15/42,730.83 = 20,909.01/x
  3. Step 3: Cross multiply
    30,939.15x = 42,730.83 × 20,909.01
  4. Step 4: Simplify right side
    30,939.15x = 893,459,351.78
  5. Step 5: Solve for x
    x = 893,459,351.78/30,939.15
  6. Step 6: Final answer
    x = 28,877.95

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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.