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Finding the Fourth Proportional to 66,381.40, 91,602.06 and 39,525.88

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Solution

The fourth proportional to 66,381.40, 91,602.06 and 39,525.88 is: 54,543.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,381.40 : 91,602.06 = 39,525.88 : x
  2. Step 2: Convert to fraction form
    66,381.40/91,602.06 = 39,525.88/x
  3. Step 3: Cross multiply
    66,381.40x = 91,602.06 × 39,525.88
  4. Step 4: Simplify right side
    66,381.40x = 3,620,652,031.31
  5. Step 5: Solve for x
    x = 3,620,652,031.31/66,381.40
  6. Step 6: Final answer
    x = 54,543.17

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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.