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Finding the Fourth Proportional to 86,945.40, 130,418.10 and 79,655.40

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Solution

The fourth proportional to 86,945.40, 130,418.10 and 79,655.40 is: 119,483.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,945.40 : 130,418.10 = 79,655.40 : x
  2. Step 2: Convert to fraction form
    86,945.40/130,418.10 = 79,655.40/x
  3. Step 3: Cross multiply
    86,945.40x = 130,418.10 × 79,655.40
  4. Step 4: Simplify right side
    86,945.40x = 10,388,505,922.74
  5. Step 5: Solve for x
    x = 10,388,505,922.74/86,945.40
  6. Step 6: Final answer
    x = 119,483.10

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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.