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Finding the Fourth Proportional to 57,880.40, 86,820.60 and 42,136.40

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Solution

The fourth proportional to 57,880.40, 86,820.60 and 42,136.40 is: 63,204.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,880.40 : 86,820.60 = 42,136.40 : x
  2. Step 2: Convert to fraction form
    57,880.40/86,820.60 = 42,136.40/x
  3. Step 3: Cross multiply
    57,880.40x = 86,820.60 × 42,136.40
  4. Step 4: Simplify right side
    57,880.40x = 3,658,307,529.84
  5. Step 5: Solve for x
    x = 3,658,307,529.84/57,880.40
  6. Step 6: Final answer
    x = 63,204.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.