Home / 21,119.61-31,657.46-11,128.89

Finding the Fourth Proportional to 21,119.61, 31,657.46 and 11,128.89

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Solution

The fourth proportional to 21,119.61, 31,657.46 and 11,128.89 is: 16,681.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,119.61 : 31,657.46 = 11,128.89 : x
  2. Step 2: Convert to fraction form
    21,119.61/31,657.46 = 11,128.89/x
  3. Step 3: Cross multiply
    21,119.61x = 31,657.46 × 11,128.89
  4. Step 4: Simplify right side
    21,119.61x = 352,312,334.37
  5. Step 5: Solve for x
    x = 352,312,334.37/21,119.61
  6. Step 6: Final answer
    x = 16,681.76

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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.