Home / 20,987.98-31,487.38-7,840.46

Finding the Fourth Proportional to 20,987.98, 31,487.38 and 7,840.46

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Solution

The fourth proportional to 20,987.98, 31,487.38 and 7,840.46 is: 11,762.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.98 : 31,487.38 = 7,840.46 : x
  2. Step 2: Convert to fraction form
    20,987.98/31,487.38 = 7,840.46/x
  3. Step 3: Cross multiply
    20,987.98x = 31,487.38 × 7,840.46
  4. Step 4: Simplify right side
    20,987.98x = 246,875,543.39
  5. Step 5: Solve for x
    x = 246,875,543.39/20,987.98
  6. Step 6: Final answer
    x = 11,762.71

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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.