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Finding the Fourth Proportional to 66,478.72, 99,718.70 and 19,731.60

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Solution

The fourth proportional to 66,478.72, 99,718.70 and 19,731.60 is: 29,597.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,478.72 : 99,718.70 = 19,731.60 : x
  2. Step 2: Convert to fraction form
    66,478.72/99,718.70 = 19,731.60/x
  3. Step 3: Cross multiply
    66,478.72x = 99,718.70 × 19,731.60
  4. Step 4: Simplify right side
    66,478.72x = 1,967,609,500.92
  5. Step 5: Solve for x
    x = 1,967,609,500.92/66,478.72
  6. Step 6: Final answer
    x = 29,597.58

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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.