Home / 28,130.78-38,819.43-15,555.74

Finding the Fourth Proportional to 28,130.78, 38,819.43 and 15,555.74

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Solution

The fourth proportional to 28,130.78, 38,819.43 and 15,555.74 is: 21,466.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,130.78 : 38,819.43 = 15,555.74 : x
  2. Step 2: Convert to fraction form
    28,130.78/38,819.43 = 15,555.74/x
  3. Step 3: Cross multiply
    28,130.78x = 38,819.43 × 15,555.74
  4. Step 4: Simplify right side
    28,130.78x = 603,864,960.03
  5. Step 5: Solve for x
    x = 603,864,960.03/28,130.78
  6. Step 6: Final answer
    x = 21,466.34

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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.