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Finding the Fourth Proportional to 28,356, 39,131.28 and 15,780.76

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Solution

The fourth proportional to 28,356, 39,131.28 and 15,780.76 is: 21,777.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356 : 39,131.28 = 15,780.76 : x
  2. Step 2: Convert to fraction form
    28,356/39,131.28 = 15,780.76/x
  3. Step 3: Cross multiply
    28,356x = 39,131.28 × 15,780.76
  4. Step 4: Simplify right side
    28,356x = 617,521,338.17
  5. Step 5: Solve for x
    x = 617,521,338.17/28,356
  6. Step 6: Final answer
    x = 21,777.45

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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.