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Finding the Fourth Proportional to 90,782.40, 136,108.80 and 40,821.60

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Solution

The fourth proportional to 90,782.40, 136,108.80 and 40,821.60 is: 61,203.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,782.40 : 136,108.80 = 40,821.60 : x
  2. Step 2: Convert to fraction form
    90,782.40/136,108.80 = 40,821.60/x
  3. Step 3: Cross multiply
    90,782.40x = 136,108.80 × 40,821.60
  4. Step 4: Simplify right side
    90,782.40x = 5,556,178,990.08
  5. Step 5: Solve for x
    x = 5,556,178,990.08/90,782.40
  6. Step 6: Final answer
    x = 61,203.26

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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.