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Finding the Fourth Proportional to 971.79, 1,340.31 and 901.32

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Solution

The fourth proportional to 971.79, 1,340.31 and 901.32 is: 1,243.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.79 : 1,340.31 = 901.32 : x
  2. Step 2: Convert to fraction form
    971.79/1,340.31 = 901.32/x
  3. Step 3: Cross multiply
    971.79x = 1,340.31 × 901.32
  4. Step 4: Simplify right side
    971.79x = 1,208,048.21
  5. Step 5: Solve for x
    x = 1,208,048.21/971.79
  6. Step 6: Final answer
    x = 1,243.12

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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.