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Finding the Fourth Proportional to 873.52, 1,309.86 and 257.08

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Solution

The fourth proportional to 873.52, 1,309.86 and 257.08 is: 385.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.52 : 1,309.86 = 257.08 : x
  2. Step 2: Convert to fraction form
    873.52/1,309.86 = 257.08/x
  3. Step 3: Cross multiply
    873.52x = 1,309.86 × 257.08
  4. Step 4: Simplify right side
    873.52x = 336,738.81
  5. Step 5: Solve for x
    x = 336,738.81/873.52
  6. Step 6: Final answer
    x = 385.50

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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.