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Finding the Fourth Proportional to 111,312.40, 166,579.80 and 77,875.60

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Solution

The fourth proportional to 111,312.40, 166,579.80 and 77,875.60 is: 116,541.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,312.40 : 166,579.80 = 77,875.60 : x
  2. Step 2: Convert to fraction form
    111,312.40/166,579.80 = 77,875.60/x
  3. Step 3: Cross multiply
    111,312.40x = 166,579.80 × 77,875.60
  4. Step 4: Simplify right side
    111,312.40x = 12,972,501,872.88
  5. Step 5: Solve for x
    x = 12,972,501,872.88/111,312.40
  6. Step 6: Final answer
    x = 116,541.39

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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.