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Finding the Fourth Proportional to 28,405.76, 42,608.57 and 8,416.81

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Solution

The fourth proportional to 28,405.76, 42,608.57 and 8,416.81 is: 12,625.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.76 : 42,608.57 = 8,416.81 : x
  2. Step 2: Convert to fraction form
    28,405.76/42,608.57 = 8,416.81/x
  3. Step 3: Cross multiply
    28,405.76x = 42,608.57 × 8,416.81
  4. Step 4: Simplify right side
    28,405.76x = 358,628,089.46
  5. Step 5: Solve for x
    x = 358,628,089.46/28,405.76
  6. Step 6: Final answer
    x = 12,625.19

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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.