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Finding the Fourth Proportional to 66,449.60, 99,703.20 and 31,371.20

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Solution

The fourth proportional to 66,449.60, 99,703.20 and 31,371.20 is: 47,070.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,449.60 : 99,703.20 = 31,371.20 : x
  2. Step 2: Convert to fraction form
    66,449.60/99,703.20 = 31,371.20/x
  3. Step 3: Cross multiply
    66,449.60x = 99,703.20 × 31,371.20
  4. Step 4: Simplify right side
    66,449.60x = 3,127,809,027.84
  5. Step 5: Solve for x
    x = 3,127,809,027.84/66,449.60
  6. Step 6: Final answer
    x = 47,070.40

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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.