Home / 21,689.21-29,931.33-12,739.58

Finding the Fourth Proportional to 21,689.21, 29,931.33 and 12,739.58

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Solution

The fourth proportional to 21,689.21, 29,931.33 and 12,739.58 is: 17,580.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.21 : 29,931.33 = 12,739.58 : x
  2. Step 2: Convert to fraction form
    21,689.21/29,931.33 = 12,739.58/x
  3. Step 3: Cross multiply
    21,689.21x = 29,931.33 × 12,739.58
  4. Step 4: Simplify right side
    21,689.21x = 381,312,423.38
  5. Step 5: Solve for x
    x = 381,312,423.38/21,689.21
  6. Step 6: Final answer
    x = 17,580.75

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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.