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Finding the Fourth Proportional to 971.65, 1,340.94 and 578.62

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Solution

The fourth proportional to 971.65, 1,340.94 and 578.62 is: 798.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.65 : 1,340.94 = 578.62 : x
  2. Step 2: Convert to fraction form
    971.65/1,340.94 = 578.62/x
  3. Step 3: Cross multiply
    971.65x = 1,340.94 × 578.62
  4. Step 4: Simplify right side
    971.65x = 775,894.70
  5. Step 5: Solve for x
    x = 775,894.70/971.65
  6. Step 6: Final answer
    x = 798.53

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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.