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Finding the Fourth Proportional to 1,308.65, 1,963.65 and 578.72

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Solution

The fourth proportional to 1,308.65, 1,963.65 and 578.72 is: 868.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.65 : 1,963.65 = 578.72 : x
  2. Step 2: Convert to fraction form
    1,308.65/1,963.65 = 578.72/x
  3. Step 3: Cross multiply
    1,308.65x = 1,963.65 × 578.72
  4. Step 4: Simplify right side
    1,308.65x = 1,136,393.71
  5. Step 5: Solve for x
    x = 1,136,393.71/1,308.65
  6. Step 6: Final answer
    x = 868.37

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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.