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Finding the Fourth Proportional to 65,868.40, 90,915.96 and 40,703.68

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Solution

The fourth proportional to 65,868.40, 90,915.96 and 40,703.68 is: 56,181.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,868.40 : 90,915.96 = 40,703.68 : x
  2. Step 2: Convert to fraction form
    65,868.40/90,915.96 = 40,703.68/x
  3. Step 3: Cross multiply
    65,868.40x = 90,915.96 × 40,703.68
  4. Step 4: Simplify right side
    65,868.40x = 3,700,614,142.73
  5. Step 5: Solve for x
    x = 3,700,614,142.73/65,868.40
  6. Step 6: Final answer
    x = 56,181.93

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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.