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Finding the Fourth Proportional to 28,407.74, 42,617.70 and 8,687.76

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Solution

The fourth proportional to 28,407.74, 42,617.70 and 8,687.76 is: 13,033.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407.74 : 42,617.70 = 8,687.76 : x
  2. Step 2: Convert to fraction form
    28,407.74/42,617.70 = 8,687.76/x
  3. Step 3: Cross multiply
    28,407.74x = 42,617.70 × 8,687.76
  4. Step 4: Simplify right side
    28,407.74x = 370,252,349.35
  5. Step 5: Solve for x
    x = 370,252,349.35/28,407.74
  6. Step 6: Final answer
    x = 13,033.50

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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.