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Finding the Fourth Proportional to 86,812.40, 130,218.60 and 53,424.20

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Solution

The fourth proportional to 86,812.40, 130,218.60 and 53,424.20 is: 80,136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,812.40 : 130,218.60 = 53,424.20 : x
  2. Step 2: Convert to fraction form
    86,812.40/130,218.60 = 53,424.20/x
  3. Step 3: Cross multiply
    86,812.40x = 130,218.60 × 53,424.20
  4. Step 4: Simplify right side
    86,812.40x = 6,956,824,530.12
  5. Step 5: Solve for x
    x = 6,956,824,530.12/86,812.40
  6. Step 6: Final answer
    x = 80,136.30

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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.