Home / 30,981.86-42,755.13-18,235.52

Finding the Fourth Proportional to 30,981.86, 42,755.13 and 18,235.52

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Solution

The fourth proportional to 30,981.86, 42,755.13 and 18,235.52 is: 25,165.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,981.86 : 42,755.13 = 18,235.52 : x
  2. Step 2: Convert to fraction form
    30,981.86/42,755.13 = 18,235.52/x
  3. Step 3: Cross multiply
    30,981.86x = 42,755.13 × 18,235.52
  4. Step 4: Simplify right side
    30,981.86x = 779,661,814.44
  5. Step 5: Solve for x
    x = 779,661,814.44/30,981.86
  6. Step 6: Final answer
    x = 25,165.11

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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.