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Finding the Fourth Proportional to 1,861.57, 2,790.64 and 924.31

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Solution

The fourth proportional to 1,861.57, 2,790.64 and 924.31 is: 1,385.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.57 : 2,790.64 = 924.31 : x
  2. Step 2: Convert to fraction form
    1,861.57/2,790.64 = 924.31/x
  3. Step 3: Cross multiply
    1,861.57x = 2,790.64 × 924.31
  4. Step 4: Simplify right side
    1,861.57x = 2,579,416.46
  5. Step 5: Solve for x
    x = 2,579,416.46/1,861.57
  6. Step 6: Final answer
    x = 1,385.61

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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.