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Finding the Fourth Proportional to 8,956.81, 12,360.81 and 4,978.32

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Solution

The fourth proportional to 8,956.81, 12,360.81 and 4,978.32 is: 6,870.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,956.81 : 12,360.81 = 4,978.32 : x
  2. Step 2: Convert to fraction form
    8,956.81/12,360.81 = 4,978.32/x
  3. Step 3: Cross multiply
    8,956.81x = 12,360.81 × 4,978.32
  4. Step 4: Simplify right side
    8,956.81x = 61,536,067.64
  5. Step 5: Solve for x
    x = 61,536,067.64/8,956.81
  6. Step 6: Final answer
    x = 6,870.31

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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.