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Finding the Fourth Proportional to 66,495.66, 91,775.88 and 39,639.90

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Solution

The fourth proportional to 66,495.66, 91,775.88 and 39,639.90 is: 54,710.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,495.66 : 91,775.88 = 39,639.90 : x
  2. Step 2: Convert to fraction form
    66,495.66/91,775.88 = 39,639.90/x
  3. Step 3: Cross multiply
    66,495.66x = 91,775.88 × 39,639.90
  4. Step 4: Simplify right side
    66,495.66x = 3,637,986,705.61
  5. Step 5: Solve for x
    x = 3,637,986,705.61/66,495.66
  6. Step 6: Final answer
    x = 54,710.14

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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.