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Finding the Fourth Proportional to 713.70, 1,071.65 and 389.70

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Solution

The fourth proportional to 713.70, 1,071.65 and 389.70 is: 585.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.70 : 1,071.65 = 389.70 : x
  2. Step 2: Convert to fraction form
    713.70/1,071.65 = 389.70/x
  3. Step 3: Cross multiply
    713.70x = 1,071.65 × 389.70
  4. Step 4: Simplify right side
    713.70x = 417,622.01
  5. Step 5: Solve for x
    x = 417,622.01/713.70
  6. Step 6: Final answer
    x = 585.15

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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.