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Finding the Fourth Proportional to 66,425.40, 99,688.14 and 45,315.54

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Solution

The fourth proportional to 66,425.40, 99,688.14 and 45,315.54 is: 68,007.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,425.40 : 99,688.14 = 45,315.54 : x
  2. Step 2: Convert to fraction form
    66,425.40/99,688.14 = 45,315.54/x
  3. Step 3: Cross multiply
    66,425.40x = 99,688.14 × 45,315.54
  4. Step 4: Simplify right side
    66,425.40x = 4,517,421,895.70
  5. Step 5: Solve for x
    x = 4,517,421,895.70/66,425.40
  6. Step 6: Final answer
    x = 68,007.45

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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.