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Finding the Fourth Proportional to 581.72, 802.79 and 319.75

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Solution

The fourth proportional to 581.72, 802.79 and 319.75 is: 441.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.72 : 802.79 = 319.75 : x
  2. Step 2: Convert to fraction form
    581.72/802.79 = 319.75/x
  3. Step 3: Cross multiply
    581.72x = 802.79 × 319.75
  4. Step 4: Simplify right side
    581.72x = 256,686.49
  5. Step 5: Solve for x
    x = 256,686.49/581.72
  6. Step 6: Final answer
    x = 441.25

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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.