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Finding the Fourth Proportional to 28,423.68, 42,640.32 and 8,700.12

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Solution

The fourth proportional to 28,423.68, 42,640.32 and 8,700.12 is: 13,051.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,423.68 : 42,640.32 = 8,700.12 : x
  2. Step 2: Convert to fraction form
    28,423.68/42,640.32 = 8,700.12/x
  3. Step 3: Cross multiply
    28,423.68x = 42,640.32 × 8,700.12
  4. Step 4: Simplify right side
    28,423.68x = 370,975,900.84
  5. Step 5: Solve for x
    x = 370,975,900.84/28,423.68
  6. Step 6: Final answer
    x = 13,051.65

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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.