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Finding the Fourth Proportional to 66,490.40, 91,772.50 and 38,212.48

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Solution

The fourth proportional to 66,490.40, 91,772.50 and 38,212.48 is: 52,742.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,490.40 : 91,772.50 = 38,212.48 : x
  2. Step 2: Convert to fraction form
    66,490.40/91,772.50 = 38,212.48/x
  3. Step 3: Cross multiply
    66,490.40x = 91,772.50 × 38,212.48
  4. Step 4: Simplify right side
    66,490.40x = 3,506,854,820.80
  5. Step 5: Solve for x
    x = 3,506,854,820.80/66,490.40
  6. Step 6: Final answer
    x = 52,742.27

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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.