Home / 19,931.16-29,899.71-12,428.61

Finding the Fourth Proportional to 19,931.16, 29,899.71 and 12,428.61

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Solution

The fourth proportional to 19,931.16, 29,899.71 and 12,428.61 is: 18,644.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,931.16 : 29,899.71 = 12,428.61 : x
  2. Step 2: Convert to fraction form
    19,931.16/29,899.71 = 12,428.61/x
  3. Step 3: Cross multiply
    19,931.16x = 29,899.71 × 12,428.61
  4. Step 4: Simplify right side
    19,931.16x = 371,611,834.70
  5. Step 5: Solve for x
    x = 371,611,834.70/19,931.16
  6. Step 6: Final answer
    x = 18,644.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.