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Finding the Fourth Proportional to 66,491.12, 91,769.14 and 63,501.68

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Solution

The fourth proportional to 66,491.12, 91,769.14 and 63,501.68 is: 87,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,491.12 : 91,769.14 = 63,501.68 : x
  2. Step 2: Convert to fraction form
    66,491.12/91,769.14 = 63,501.68/x
  3. Step 3: Cross multiply
    66,491.12x = 91,769.14 × 63,501.68
  4. Step 4: Simplify right side
    66,491.12x = 5,827,494,562.16
  5. Step 5: Solve for x
    x = 5,827,494,562.16/66,491.12
  6. Step 6: Final answer
    x = 87,643.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.