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Finding the Fourth Proportional to 8,957.78, 12,361.14 and 4,978.88

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Solution

The fourth proportional to 8,957.78, 12,361.14 and 4,978.88 is: 6,870.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,957.78 : 12,361.14 = 4,978.88 : x
  2. Step 2: Convert to fraction form
    8,957.78/12,361.14 = 4,978.88/x
  3. Step 3: Cross multiply
    8,957.78x = 12,361.14 × 4,978.88
  4. Step 4: Simplify right side
    8,957.78x = 61,544,632.72
  5. Step 5: Solve for x
    x = 61,544,632.72/8,957.78
  6. Step 6: Final answer
    x = 6,870.52

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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.