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Finding the Fourth Proportional to 581.42, 802.35 and 385.07

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Solution

The fourth proportional to 581.42, 802.35 and 385.07 is: 531.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.42 : 802.35 = 385.07 : x
  2. Step 2: Convert to fraction form
    581.42/802.35 = 385.07/x
  3. Step 3: Cross multiply
    581.42x = 802.35 × 385.07
  4. Step 4: Simplify right side
    581.42x = 308,960.91
  5. Step 5: Solve for x
    x = 308,960.91/581.42
  6. Step 6: Final answer
    x = 531.39

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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.