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Finding the Fourth Proportional to 153,990.72, 212,506.56 and 86,921.28

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Solution

The fourth proportional to 153,990.72, 212,506.56 and 86,921.28 is: 119,951.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,990.72 : 212,506.56 = 86,921.28 : x
  2. Step 2: Convert to fraction form
    153,990.72/212,506.56 = 86,921.28/x
  3. Step 3: Cross multiply
    153,990.72x = 212,506.56 × 86,921.28
  4. Step 4: Simplify right side
    153,990.72x = 18,471,342,203.60
  5. Step 5: Solve for x
    x = 18,471,342,203.60/153,990.72
  6. Step 6: Final answer
    x = 119,951.01

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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.