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Finding the Fourth Proportional to 971.01, 1,340.28 and 578.30

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Solution

The fourth proportional to 971.01, 1,340.28 and 578.30 is: 798.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.01 : 1,340.28 = 578.30 : x
  2. Step 2: Convert to fraction form
    971.01/1,340.28 = 578.30/x
  3. Step 3: Cross multiply
    971.01x = 1,340.28 × 578.30
  4. Step 4: Simplify right side
    971.01x = 775,077.22
  5. Step 5: Solve for x
    x = 775,077.22/971.01
  6. Step 6: Final answer
    x = 798.22

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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.