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Finding the Fourth Proportional to 28,628.84, 42,947.18 and 9,903.87

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Solution

The fourth proportional to 28,628.84, 42,947.18 and 9,903.87 is: 14,857.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,628.84 : 42,947.18 = 9,903.87 : x
  2. Step 2: Convert to fraction form
    28,628.84/42,947.18 = 9,903.87/x
  3. Step 3: Cross multiply
    28,628.84x = 42,947.18 × 9,903.87
  4. Step 4: Simplify right side
    28,628.84x = 425,343,275.21
  5. Step 5: Solve for x
    x = 425,343,275.21/28,628.84
  6. Step 6: Final answer
    x = 14,857.16

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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.