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Finding the Fourth Proportional to 7,710.78, 10,647.21 and 4,728.57

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Solution

The fourth proportional to 7,710.78, 10,647.21 and 4,728.57 is: 6,529.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,710.78 : 10,647.21 = 4,728.57 : x
  2. Step 2: Convert to fraction form
    7,710.78/10,647.21 = 4,728.57/x
  3. Step 3: Cross multiply
    7,710.78x = 10,647.21 × 4,728.57
  4. Step 4: Simplify right side
    7,710.78x = 50,346,077.79
  5. Step 5: Solve for x
    x = 50,346,077.79/7,710.78
  6. Step 6: Final answer
    x = 6,529.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.