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Finding the Fourth Proportional to 2,707.76, 4,061.88 and 859.28

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Solution

The fourth proportional to 2,707.76, 4,061.88 and 859.28 is: 1,289.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,707.76 : 4,061.88 = 859.28 : x
  2. Step 2: Convert to fraction form
    2,707.76/4,061.88 = 859.28/x
  3. Step 3: Cross multiply
    2,707.76x = 4,061.88 × 859.28
  4. Step 4: Simplify right side
    2,707.76x = 3,490,292.25
  5. Step 5: Solve for x
    x = 3,490,292.25/2,707.76
  6. Step 6: Final answer
    x = 1,289.00

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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.