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Finding the Fourth Proportional to 90,701.20, 136,051.80 and 53,279.20

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Solution

The fourth proportional to 90,701.20, 136,051.80 and 53,279.20 is: 79,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,701.20 : 136,051.80 = 53,279.20 : x
  2. Step 2: Convert to fraction form
    90,701.20/136,051.80 = 53,279.20/x
  3. Step 3: Cross multiply
    90,701.20x = 136,051.80 × 53,279.20
  4. Step 4: Simplify right side
    90,701.20x = 7,248,731,062.56
  5. Step 5: Solve for x
    x = 7,248,731,062.56/90,701.20
  6. Step 6: Final answer
    x = 79,918.80

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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.