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Finding the Fourth Proportional to 31,021, 42,807.90 and 16,873.60

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Solution

The fourth proportional to 31,021, 42,807.90 and 16,873.60 is: 23,284.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,021 : 42,807.90 = 16,873.60 : x
  2. Step 2: Convert to fraction form
    31,021/42,807.90 = 16,873.60/x
  3. Step 3: Cross multiply
    31,021x = 42,807.90 × 16,873.60
  4. Step 4: Simplify right side
    31,021x = 722,323,381.44
  5. Step 5: Solve for x
    x = 722,323,381.44/31,021
  6. Step 6: Final answer
    x = 23,284.98

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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.