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Finding the Fourth Proportional to 2,688.65, 4,032.95 and 839.78

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Solution

The fourth proportional to 2,688.65, 4,032.95 and 839.78 is: 1,259.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.65 : 4,032.95 = 839.78 : x
  2. Step 2: Convert to fraction form
    2,688.65/4,032.95 = 839.78/x
  3. Step 3: Cross multiply
    2,688.65x = 4,032.95 × 839.78
  4. Step 4: Simplify right side
    2,688.65x = 3,386,802.93
  5. Step 5: Solve for x
    x = 3,386,802.93/2,688.65
  6. Step 6: Final answer
    x = 1,259.67

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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.