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Finding the Fourth Proportional to 714.24, 1,071.84 and 389.84

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Solution

The fourth proportional to 714.24, 1,071.84 and 389.84 is: 585.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.24 : 1,071.84 = 389.84 : x
  2. Step 2: Convert to fraction form
    714.24/1,071.84 = 389.84/x
  3. Step 3: Cross multiply
    714.24x = 1,071.84 × 389.84
  4. Step 4: Simplify right side
    714.24x = 417,846.11
  5. Step 5: Solve for x
    x = 417,846.11/714.24
  6. Step 6: Final answer
    x = 585.02

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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.