Home / 30,981.12-42,736-18,403.44

Finding the Fourth Proportional to 30,981.12, 42,736 and 18,403.44

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Solution

The fourth proportional to 30,981.12, 42,736 and 18,403.44 is: 25,386.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,981.12 : 42,736 = 18,403.44 : x
  2. Step 2: Convert to fraction form
    30,981.12/42,736 = 18,403.44/x
  3. Step 3: Cross multiply
    30,981.12x = 42,736 × 18,403.44
  4. Step 4: Simplify right side
    30,981.12x = 786,489,411.84
  5. Step 5: Solve for x
    x = 786,489,411.84/30,981.12
  6. Step 6: Final answer
    x = 25,386.09

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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.