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Finding the Fourth Proportional to 4,678.65, 7,019.16 and 1,391.76

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Solution

The fourth proportional to 4,678.65, 7,019.16 and 1,391.76 is: 2,087.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,678.65 : 7,019.16 = 1,391.76 : x
  2. Step 2: Convert to fraction form
    4,678.65/7,019.16 = 1,391.76/x
  3. Step 3: Cross multiply
    4,678.65x = 7,019.16 × 1,391.76
  4. Step 4: Simplify right side
    4,678.65x = 9,768,986.12
  5. Step 5: Solve for x
    x = 9,768,986.12/4,678.65
  6. Step 6: Final answer
    x = 2,087.99

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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.