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Finding the Fourth Proportional to 28,798.76, 39,727.14 and 19,830.71

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Solution

The fourth proportional to 28,798.76, 39,727.14 and 19,830.71 is: 27,355.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,798.76 : 39,727.14 = 19,830.71 : x
  2. Step 2: Convert to fraction form
    28,798.76/39,727.14 = 19,830.71/x
  3. Step 3: Cross multiply
    28,798.76x = 39,727.14 × 19,830.71
  4. Step 4: Simplify right side
    28,798.76x = 787,817,392.47
  5. Step 5: Solve for x
    x = 787,817,392.47/28,798.76
  6. Step 6: Final answer
    x = 27,355.95

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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.