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Finding the Fourth Proportional to 581.80, 802.40 and 493.51

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Solution

The fourth proportional to 581.80, 802.40 and 493.51 is: 680.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.80 : 802.40 = 493.51 : x
  2. Step 2: Convert to fraction form
    581.80/802.40 = 493.51/x
  3. Step 3: Cross multiply
    581.80x = 802.40 × 493.51
  4. Step 4: Simplify right side
    581.80x = 395,992.42
  5. Step 5: Solve for x
    x = 395,992.42/581.80
  6. Step 6: Final answer
    x = 680.63

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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.