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Finding the Fourth Proportional to 43,782.88, 65,672.88 and 12,621.28

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Solution

The fourth proportional to 43,782.88, 65,672.88 and 12,621.28 is: 18,931.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,782.88 : 65,672.88 = 12,621.28 : x
  2. Step 2: Convert to fraction form
    43,782.88/65,672.88 = 12,621.28/x
  3. Step 3: Cross multiply
    43,782.88x = 65,672.88 × 12,621.28
  4. Step 4: Simplify right side
    43,782.88x = 828,875,806.89
  5. Step 5: Solve for x
    x = 828,875,806.89/43,782.88
  6. Step 6: Final answer
    x = 18,931.50

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1.5x scale

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.