Home / 31,138.32-42,980.04-21,709.92

Finding the Fourth Proportional to 31,138.32, 42,980.04 and 21,709.92

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Solution

The fourth proportional to 31,138.32, 42,980.04 and 21,709.92 is: 29,966.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.32 : 42,980.04 = 21,709.92 : x
  2. Step 2: Convert to fraction form
    31,138.32/42,980.04 = 21,709.92/x
  3. Step 3: Cross multiply
    31,138.32x = 42,980.04 × 21,709.92
  4. Step 4: Simplify right side
    31,138.32x = 933,093,230.00
  5. Step 5: Solve for x
    x = 933,093,230.00/31,138.32
  6. Step 6: Final answer
    x = 29,966.07

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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.