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Finding the Fourth Proportional to 873.35, 1,309.91 and 257.12

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Solution

The fourth proportional to 873.35, 1,309.91 and 257.12 is: 385.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.35 : 1,309.91 = 257.12 : x
  2. Step 2: Convert to fraction form
    873.35/1,309.91 = 257.12/x
  3. Step 3: Cross multiply
    873.35x = 1,309.91 × 257.12
  4. Step 4: Simplify right side
    873.35x = 336,802.58
  5. Step 5: Solve for x
    x = 336,802.58/873.35
  6. Step 6: Final answer
    x = 385.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.