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Finding the Fourth Proportional to 715.43, 1,071.02 and 389.81

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Solution

The fourth proportional to 715.43, 1,071.02 and 389.81 is: 583.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.43 : 1,071.02 = 389.81 : x
  2. Step 2: Convert to fraction form
    715.43/1,071.02 = 389.81/x
  3. Step 3: Cross multiply
    715.43x = 1,071.02 × 389.81
  4. Step 4: Simplify right side
    715.43x = 417,497.96
  5. Step 5: Solve for x
    x = 417,497.96/715.43
  6. Step 6: Final answer
    x = 583.56

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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.