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Finding the Fourth Proportional to 2,312.68, 3,191.08 and 1,368

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Solution

The fourth proportional to 2,312.68, 3,191.08 and 1,368 is: 1,887.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,312.68 : 3,191.08 = 1,368 : x
  2. Step 2: Convert to fraction form
    2,312.68/3,191.08 = 1,368/x
  3. Step 3: Cross multiply
    2,312.68x = 3,191.08 × 1,368
  4. Step 4: Simplify right side
    2,312.68x = 4,365,394.02
  5. Step 5: Solve for x
    x = 4,365,394.02/2,312.68
  6. Step 6: Final answer
    x = 1,887.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.