Home / 31,138.14-42,970.23-16,990.74

Finding the Fourth Proportional to 31,138.14, 42,970.23 and 16,990.74

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Solution

The fourth proportional to 31,138.14, 42,970.23 and 16,990.74 is: 23,447.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.14 : 42,970.23 = 16,990.74 : x
  2. Step 2: Convert to fraction form
    31,138.14/42,970.23 = 16,990.74/x
  3. Step 3: Cross multiply
    31,138.14x = 42,970.23 × 16,990.74
  4. Step 4: Simplify right side
    31,138.14x = 730,096,005.67
  5. Step 5: Solve for x
    x = 730,096,005.67/31,138.14
  6. Step 6: Final answer
    x = 23,447.00

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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.