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Finding the Fourth Proportional to 8,790.64, 12,130.72 and 4,811.50

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Solution

The fourth proportional to 8,790.64, 12,130.72 and 4,811.50 is: 6,639.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,790.64 : 12,130.72 = 4,811.50 : x
  2. Step 2: Convert to fraction form
    8,790.64/12,130.72 = 4,811.50/x
  3. Step 3: Cross multiply
    8,790.64x = 12,130.72 × 4,811.50
  4. Step 4: Simplify right side
    8,790.64x = 58,366,959.28
  5. Step 5: Solve for x
    x = 58,366,959.28/8,790.64
  6. Step 6: Final answer
    x = 6,639.67

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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.