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Finding the Fourth Proportional to 65,643.63, 90,589.98 and 40,149.56

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Solution

The fourth proportional to 65,643.63, 90,589.98 and 40,149.56 is: 55,407.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,643.63 : 90,589.98 = 40,149.56 : x
  2. Step 2: Convert to fraction form
    65,643.63/90,589.98 = 40,149.56/x
  3. Step 3: Cross multiply
    65,643.63x = 90,589.98 × 40,149.56
  4. Step 4: Simplify right side
    65,643.63x = 3,637,147,384.46
  5. Step 5: Solve for x
    x = 3,637,147,384.46/65,643.63
  6. Step 6: Final answer
    x = 55,407.47

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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.