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Finding the Fourth Proportional to 1,718.64, 2,576.16 and 986.72

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Solution

The fourth proportional to 1,718.64, 2,576.16 and 986.72 is: 1,479.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.64 : 2,576.16 = 986.72 : x
  2. Step 2: Convert to fraction form
    1,718.64/2,576.16 = 986.72/x
  3. Step 3: Cross multiply
    1,718.64x = 2,576.16 × 986.72
  4. Step 4: Simplify right side
    1,718.64x = 2,541,948.60
  5. Step 5: Solve for x
    x = 2,541,948.60/1,718.64
  6. Step 6: Final answer
    x = 1,479.05

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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.