Home / 28,381.86-39,126.05-19,857.57

Finding the Fourth Proportional to 28,381.86, 39,126.05 and 19,857.57

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Solution

The fourth proportional to 28,381.86, 39,126.05 and 19,857.57 is: 27,374.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.86 : 39,126.05 = 19,857.57 : x
  2. Step 2: Convert to fraction form
    28,381.86/39,126.05 = 19,857.57/x
  3. Step 3: Cross multiply
    28,381.86x = 39,126.05 × 19,857.57
  4. Step 4: Simplify right side
    28,381.86x = 776,948,276.70
  5. Step 5: Solve for x
    x = 776,948,276.70/28,381.86
  6. Step 6: Final answer
    x = 27,374.82

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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.