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Finding the Fourth Proportional to 86,816.40, 130,078.80 and 42,347.40

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Solution

The fourth proportional to 86,816.40, 130,078.80 and 42,347.40 is: 63,449.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,816.40 : 130,078.80 = 42,347.40 : x
  2. Step 2: Convert to fraction form
    86,816.40/130,078.80 = 42,347.40/x
  3. Step 3: Cross multiply
    86,816.40x = 130,078.80 × 42,347.40
  4. Step 4: Simplify right side
    86,816.40x = 5,508,498,975.12
  5. Step 5: Solve for x
    x = 5,508,498,975.12/86,816.40
  6. Step 6: Final answer
    x = 63,449.98

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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.