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Finding the Fourth Proportional to 937.15, 1,405.74 and 389.17

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Solution

The fourth proportional to 937.15, 1,405.74 and 389.17 is: 583.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.15 : 1,405.74 = 389.17 : x
  2. Step 2: Convert to fraction form
    937.15/1,405.74 = 389.17/x
  3. Step 3: Cross multiply
    937.15x = 1,405.74 × 389.17
  4. Step 4: Simplify right side
    937.15x = 547,071.84
  5. Step 5: Solve for x
    x = 547,071.84/937.15
  6. Step 6: Final answer
    x = 583.76

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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.