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Finding the Fourth Proportional to 581.40, 802.38 and 319.45

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Solution

The fourth proportional to 581.40, 802.38 and 319.45 is: 440.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.40 : 802.38 = 319.45 : x
  2. Step 2: Convert to fraction form
    581.40/802.38 = 319.45/x
  3. Step 3: Cross multiply
    581.40x = 802.38 × 319.45
  4. Step 4: Simplify right side
    581.40x = 256,320.29
  5. Step 5: Solve for x
    x = 256,320.29/581.40
  6. Step 6: Final answer
    x = 440.87

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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.