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Finding the Fourth Proportional to 76,830, 106,025.40 and 43,297.20

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Solution

The fourth proportional to 76,830, 106,025.40 and 43,297.20 is: 59,750.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,830 : 106,025.40 = 43,297.20 : x
  2. Step 2: Convert to fraction form
    76,830/106,025.40 = 43,297.20/x
  3. Step 3: Cross multiply
    76,830x = 106,025.40 × 43,297.20
  4. Step 4: Simplify right side
    76,830x = 4,590,602,948.88
  5. Step 5: Solve for x
    x = 4,590,602,948.88/76,830
  6. Step 6: Final answer
    x = 59,750.14

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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.