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Finding the Fourth Proportional to 153,879.98, 212,389.79 and 90,238.28

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Solution

The fourth proportional to 153,879.98, 212,389.79 and 90,238.28 is: 124,549.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,879.98 : 212,389.79 = 90,238.28 : x
  2. Step 2: Convert to fraction form
    153,879.98/212,389.79 = 90,238.28/x
  3. Step 3: Cross multiply
    153,879.98x = 212,389.79 × 90,238.28
  4. Step 4: Simplify right side
    153,879.98x = 19,165,687,826.02
  5. Step 5: Solve for x
    x = 19,165,687,826.02/153,879.98
  6. Step 6: Final answer
    x = 124,549.59

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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.