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Finding the Fourth Proportional to 28,485.66, 42,730.92 and 7,428.50

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Solution

The fourth proportional to 28,485.66, 42,730.92 and 7,428.50 is: 11,143.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,485.66 : 42,730.92 = 7,428.50 : x
  2. Step 2: Convert to fraction form
    28,485.66/42,730.92 = 7,428.50/x
  3. Step 3: Cross multiply
    28,485.66x = 42,730.92 × 7,428.50
  4. Step 4: Simplify right side
    28,485.66x = 317,426,639.22
  5. Step 5: Solve for x
    x = 317,426,639.22/28,485.66
  6. Step 6: Final answer
    x = 11,143.38

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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.