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Finding the Fourth Proportional to 28,425.68, 42,643.32 and 8,702.12

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Solution

The fourth proportional to 28,425.68, 42,643.32 and 8,702.12 is: 13,054.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,425.68 : 42,643.32 = 8,702.12 : x
  2. Step 2: Convert to fraction form
    28,425.68/42,643.32 = 8,702.12/x
  3. Step 3: Cross multiply
    28,425.68x = 42,643.32 × 8,702.12
  4. Step 4: Simplify right side
    28,425.68x = 371,087,287.84
  5. Step 5: Solve for x
    x = 371,087,287.84/28,425.68
  6. Step 6: Final answer
    x = 13,054.65

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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.