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Finding the Fourth Proportional to 18,857.70, 28,276.77 and 7,762.32

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Solution

The fourth proportional to 18,857.70, 28,276.77 and 7,762.32 is: 11,639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,857.70 : 28,276.77 = 7,762.32 : x
  2. Step 2: Convert to fraction form
    18,857.70/28,276.77 = 7,762.32/x
  3. Step 3: Cross multiply
    18,857.70x = 28,276.77 × 7,762.32
  4. Step 4: Simplify right side
    18,857.70x = 219,493,337.31
  5. Step 5: Solve for x
    x = 219,493,337.31/18,857.70
  6. Step 6: Final answer
    x = 11,639.45

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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.