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Finding the Fourth Proportional to 28,338.31, 42,508.95 and 9,618.94

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Solution

The fourth proportional to 28,338.31, 42,508.95 and 9,618.94 is: 14,428.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,338.31 : 42,508.95 = 9,618.94 : x
  2. Step 2: Convert to fraction form
    28,338.31/42,508.95 = 9,618.94/x
  3. Step 3: Cross multiply
    28,338.31x = 42,508.95 × 9,618.94
  4. Step 4: Simplify right side
    28,338.31x = 408,891,039.51
  5. Step 5: Solve for x
    x = 408,891,039.51/28,338.31
  6. Step 6: Final answer
    x = 14,428.91

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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.