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Finding the Fourth Proportional to 66,530.70, 99,728.55 and 56,820.42

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Solution

The fourth proportional to 66,530.70, 99,728.55 and 56,820.42 is: 85,172.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,530.70 : 99,728.55 = 56,820.42 : x
  2. Step 2: Convert to fraction form
    66,530.70/99,728.55 = 56,820.42/x
  3. Step 3: Cross multiply
    66,530.70x = 99,728.55 × 56,820.42
  4. Step 4: Simplify right side
    66,530.70x = 5,666,618,096.99
  5. Step 5: Solve for x
    x = 5,666,618,096.99/66,530.70
  6. Step 6: Final answer
    x = 85,172.98

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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.