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Finding the Fourth Proportional to 86,811.20, 130,119.60 and 49,389.20

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Solution

The fourth proportional to 86,811.20, 130,119.60 and 49,389.20 is: 74,028.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,811.20 : 130,119.60 = 49,389.20 : x
  2. Step 2: Convert to fraction form
    86,811.20/130,119.60 = 49,389.20/x
  3. Step 3: Cross multiply
    86,811.20x = 130,119.60 × 49,389.20
  4. Step 4: Simplify right side
    86,811.20x = 6,426,502,948.32
  5. Step 5: Solve for x
    x = 6,426,502,948.32/86,811.20
  6. Step 6: Final answer
    x = 74,028.50

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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.