Home / 20,783.10-31,174.65-12,488.70

Finding the Fourth Proportional to 20,783.10, 31,174.65 and 12,488.70

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Solution

The fourth proportional to 20,783.10, 31,174.65 and 12,488.70 is: 18,733.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.10 : 31,174.65 = 12,488.70 : x
  2. Step 2: Convert to fraction form
    20,783.10/31,174.65 = 12,488.70/x
  3. Step 3: Cross multiply
    20,783.10x = 31,174.65 × 12,488.70
  4. Step 4: Simplify right side
    20,783.10x = 389,330,851.46
  5. Step 5: Solve for x
    x = 389,330,851.46/20,783.10
  6. Step 6: Final answer
    x = 18,733.05

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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.