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Finding the Fourth Proportional to 66,465.81, 91,720.58 and 39,594.40

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Solution

The fourth proportional to 66,465.81, 91,720.58 and 39,594.40 is: 54,638.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,465.81 : 91,720.58 = 39,594.40 : x
  2. Step 2: Convert to fraction form
    66,465.81/91,720.58 = 39,594.40/x
  3. Step 3: Cross multiply
    66,465.81x = 91,720.58 × 39,594.40
  4. Step 4: Simplify right side
    66,465.81x = 3,631,620,676.18
  5. Step 5: Solve for x
    x = 3,631,620,676.18/66,465.81
  6. Step 6: Final answer
    x = 54,638.93

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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.