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Finding the Fourth Proportional to 66,230.40, 99,345.60 and 39,986.40

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Solution

The fourth proportional to 66,230.40, 99,345.60 and 39,986.40 is: 59,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,230.40 : 99,345.60 = 39,986.40 : x
  2. Step 2: Convert to fraction form
    66,230.40/99,345.60 = 39,986.40/x
  3. Step 3: Cross multiply
    66,230.40x = 99,345.60 × 39,986.40
  4. Step 4: Simplify right side
    66,230.40x = 3,972,472,899.84
  5. Step 5: Solve for x
    x = 3,972,472,899.84/66,230.40
  6. Step 6: Final answer
    x = 59,979.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.