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Finding the Fourth Proportional to 85,868.52, 118,361.64 and 67,689.60

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Solution

The fourth proportional to 85,868.52, 118,361.64 and 67,689.60 is: 93,303.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,868.52 : 118,361.64 = 67,689.60 : x
  2. Step 2: Convert to fraction form
    85,868.52/118,361.64 = 67,689.60/x
  3. Step 3: Cross multiply
    85,868.52x = 118,361.64 × 67,689.60
  4. Step 4: Simplify right side
    85,868.52x = 8,011,851,728.50
  5. Step 5: Solve for x
    x = 8,011,851,728.50/85,868.52
  6. Step 6: Final answer
    x = 93,303.71

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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.