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Finding the Fourth Proportional to 66,216.81, 91,378.89 and 39,008.71

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Solution

The fourth proportional to 66,216.81, 91,378.89 and 39,008.71 is: 53,831.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,216.81 : 91,378.89 = 39,008.71 : x
  2. Step 2: Convert to fraction form
    66,216.81/91,378.89 = 39,008.71/x
  3. Step 3: Cross multiply
    66,216.81x = 91,378.89 × 39,008.71
  4. Step 4: Simplify right side
    66,216.81x = 3,564,572,620.13
  5. Step 5: Solve for x
    x = 3,564,572,620.13/66,216.81
  6. Step 6: Final answer
    x = 53,831.84

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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.