Home / 31,000.98-42,788.16-20,391.60

Finding the Fourth Proportional to 31,000.98, 42,788.16 and 20,391.60

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Solution

The fourth proportional to 31,000.98, 42,788.16 and 20,391.60 is: 28,144.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,000.98 : 42,788.16 = 20,391.60 : x
  2. Step 2: Convert to fraction form
    31,000.98/42,788.16 = 20,391.60/x
  3. Step 3: Cross multiply
    31,000.98x = 42,788.16 × 20,391.60
  4. Step 4: Simplify right side
    31,000.98x = 872,519,043.46
  5. Step 5: Solve for x
    x = 872,519,043.46/31,000.98
  6. Step 6: Final answer
    x = 28,144.89

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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.