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Finding the Fourth Proportional to 971.57, 1,340.47 and 578.32

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Solution

The fourth proportional to 971.57, 1,340.47 and 578.32 is: 797.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.57 : 1,340.47 = 578.32 : x
  2. Step 2: Convert to fraction form
    971.57/1,340.47 = 578.32/x
  3. Step 3: Cross multiply
    971.57x = 1,340.47 × 578.32
  4. Step 4: Simplify right side
    971.57x = 775,220.61
  5. Step 5: Solve for x
    x = 775,220.61/971.57
  6. Step 6: Final answer
    x = 797.91

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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.