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Finding the Fourth Proportional to 1,312.98, 1,968.06 and 581.56

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Solution

The fourth proportional to 1,312.98, 1,968.06 and 581.56 is: 871.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.98 : 1,968.06 = 581.56 : x
  2. Step 2: Convert to fraction form
    1,312.98/1,968.06 = 581.56/x
  3. Step 3: Cross multiply
    1,312.98x = 1,968.06 × 581.56
  4. Step 4: Simplify right side
    1,312.98x = 1,144,544.97
  5. Step 5: Solve for x
    x = 1,144,544.97/1,312.98
  6. Step 6: Final answer
    x = 871.72

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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.