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Finding the Fourth Proportional to 66,210.63, 91,378.28 and 39,352.87

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Solution

The fourth proportional to 66,210.63, 91,378.28 and 39,352.87 is: 54,311.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,210.63 : 91,378.28 = 39,352.87 : x
  2. Step 2: Convert to fraction form
    66,210.63/91,378.28 = 39,352.87/x
  3. Step 3: Cross multiply
    66,210.63x = 91,378.28 × 39,352.87
  4. Step 4: Simplify right side
    66,210.63x = 3,595,997,573.66
  5. Step 5: Solve for x
    x = 3,595,997,573.66/66,210.63
  6. Step 6: Final answer
    x = 54,311.48

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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.