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Finding the Fourth Proportional to 28,086.35, 42,129.72 and 8,365.28

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Solution

The fourth proportional to 28,086.35, 42,129.72 and 8,365.28 is: 12,547.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,086.35 : 42,129.72 = 8,365.28 : x
  2. Step 2: Convert to fraction form
    28,086.35/42,129.72 = 8,365.28/x
  3. Step 3: Cross multiply
    28,086.35x = 42,129.72 × 8,365.28
  4. Step 4: Simplify right side
    28,086.35x = 352,426,693.47
  5. Step 5: Solve for x
    x = 352,426,693.47/28,086.35
  6. Step 6: Final answer
    x = 12,547.97

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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.