Home / 20,975.61-31,430.16-12,644.76

Finding the Fourth Proportional to 20,975.61, 31,430.16 and 12,644.76

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Solution

The fourth proportional to 20,975.61, 31,430.16 and 12,644.76 is: 18,947.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.61 : 31,430.16 = 12,644.76 : x
  2. Step 2: Convert to fraction form
    20,975.61/31,430.16 = 12,644.76/x
  3. Step 3: Cross multiply
    20,975.61x = 31,430.16 × 12,644.76
  4. Step 4: Simplify right side
    20,975.61x = 397,426,829.96
  5. Step 5: Solve for x
    x = 397,426,829.96/20,975.61
  6. Step 6: Final answer
    x = 18,947.09

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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.