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Finding the Fourth Proportional to 2,875, 4,312.74 and 823

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Solution

The fourth proportional to 2,875, 4,312.74 and 823 is: 1,234.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,875 : 4,312.74 = 823 : x
  2. Step 2: Convert to fraction form
    2,875/4,312.74 = 823/x
  3. Step 3: Cross multiply
    2,875x = 4,312.74 × 823
  4. Step 4: Simplify right side
    2,875x = 3,549,385.02
  5. Step 5: Solve for x
    x = 3,549,385.02/2,875
  6. Step 6: Final answer
    x = 1,234.57

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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.