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Finding the Fourth Proportional to 66,005.20, 91,065.60 and 42,139.60

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Solution

The fourth proportional to 66,005.20, 91,065.60 and 42,139.60 is: 58,138.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,005.20 : 91,065.60 = 42,139.60 : x
  2. Step 2: Convert to fraction form
    66,005.20/91,065.60 = 42,139.60/x
  3. Step 3: Cross multiply
    66,005.20x = 91,065.60 × 42,139.60
  4. Step 4: Simplify right side
    66,005.20x = 3,837,467,957.76
  5. Step 5: Solve for x
    x = 3,837,467,957.76/66,005.20
  6. Step 6: Final answer
    x = 58,138.87

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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.