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Finding the Fourth Proportional to 19,285.40, 28,928.10 and 6,139.10

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Solution

The fourth proportional to 19,285.40, 28,928.10 and 6,139.10 is: 9,208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,285.40 : 28,928.10 = 6,139.10 : x
  2. Step 2: Convert to fraction form
    19,285.40/28,928.10 = 6,139.10/x
  3. Step 3: Cross multiply
    19,285.40x = 28,928.10 × 6,139.10
  4. Step 4: Simplify right side
    19,285.40x = 177,592,498.71
  5. Step 5: Solve for x
    x = 177,592,498.71/19,285.40
  6. Step 6: Final answer
    x = 9,208.65

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Similar ratio
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1.5x scale

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.