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Finding the Fourth Proportional to 903.92, 1,356.15 and 287.72

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Solution

The fourth proportional to 903.92, 1,356.15 and 287.72 is: 431.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.92 : 1,356.15 = 287.72 : x
  2. Step 2: Convert to fraction form
    903.92/1,356.15 = 287.72/x
  3. Step 3: Cross multiply
    903.92x = 1,356.15 × 287.72
  4. Step 4: Simplify right side
    903.92x = 390,184.70
  5. Step 5: Solve for x
    x = 390,184.70/903.92
  6. Step 6: Final answer
    x = 431.66

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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.