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Finding the Fourth Proportional to 979.72, 1,351.85 and 581.28

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Solution

The fourth proportional to 979.72, 1,351.85 and 581.28 is: 802.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.72 : 1,351.85 = 581.28 : x
  2. Step 2: Convert to fraction form
    979.72/1,351.85 = 581.28/x
  3. Step 3: Cross multiply
    979.72x = 1,351.85 × 581.28
  4. Step 4: Simplify right side
    979.72x = 785,803.37
  5. Step 5: Solve for x
    x = 785,803.37/979.72
  6. Step 6: Final answer
    x = 802.07

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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.