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Finding the Fourth Proportional to 28,639.02, 42,964.70 and 8,646.85

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Solution

The fourth proportional to 28,639.02, 42,964.70 and 8,646.85 is: 12,972.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,639.02 : 42,964.70 = 8,646.85 : x
  2. Step 2: Convert to fraction form
    28,639.02/42,964.70 = 8,646.85/x
  3. Step 3: Cross multiply
    28,639.02x = 42,964.70 × 8,646.85
  4. Step 4: Simplify right side
    28,639.02x = 371,509,316.20
  5. Step 5: Solve for x
    x = 371,509,316.20/28,639.02
  6. Step 6: Final answer
    x = 12,972.14

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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.