Home / 30,878.10-42,619.92-21,319.56

Finding the Fourth Proportional to 30,878.10, 42,619.92 and 21,319.56

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Solution

The fourth proportional to 30,878.10, 42,619.92 and 21,319.56 is: 29,426.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,878.10 : 42,619.92 = 21,319.56 : x
  2. Step 2: Convert to fraction form
    30,878.10/42,619.92 = 21,319.56/x
  3. Step 3: Cross multiply
    30,878.10x = 42,619.92 × 21,319.56
  4. Step 4: Simplify right side
    30,878.10x = 908,637,941.64
  5. Step 5: Solve for x
    x = 908,637,941.64/30,878.10
  6. Step 6: Final answer
    x = 29,426.61

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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.