Home / 30,781.72-42,489.30-18,038.98

Finding the Fourth Proportional to 30,781.72, 42,489.30 and 18,038.98

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Solution

The fourth proportional to 30,781.72, 42,489.30 and 18,038.98 is: 24,899.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,781.72 : 42,489.30 = 18,038.98 : x
  2. Step 2: Convert to fraction form
    30,781.72/42,489.30 = 18,038.98/x
  3. Step 3: Cross multiply
    30,781.72x = 42,489.30 × 18,038.98
  4. Step 4: Simplify right side
    30,781.72x = 766,463,632.91
  5. Step 5: Solve for x
    x = 766,463,632.91/30,781.72
  6. Step 6: Final answer
    x = 24,899.96

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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.