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Finding the Fourth Proportional to 66,288.51, 91,447.86 and 39,415.71

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Solution

The fourth proportional to 66,288.51, 91,447.86 and 39,415.71 is: 54,375.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,288.51 : 91,447.86 = 39,415.71 : x
  2. Step 2: Convert to fraction form
    66,288.51/91,447.86 = 39,415.71/x
  3. Step 3: Cross multiply
    66,288.51x = 91,447.86 × 39,415.71
  4. Step 4: Simplify right side
    66,288.51x = 3,604,482,329.88
  5. Step 5: Solve for x
    x = 3,604,482,329.88/66,288.51
  6. Step 6: Final answer
    x = 54,375.67

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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.