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Finding the Fourth Proportional to 86,880.80, 130,288.80 and 34,279.40

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Solution

The fourth proportional to 86,880.80, 130,288.80 and 34,279.40 is: 51,406.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,880.80 : 130,288.80 = 34,279.40 : x
  2. Step 2: Convert to fraction form
    86,880.80/130,288.80 = 34,279.40/x
  3. Step 3: Cross multiply
    86,880.80x = 130,288.80 × 34,279.40
  4. Step 4: Simplify right side
    86,880.80x = 4,466,221,890.72
  5. Step 5: Solve for x
    x = 4,466,221,890.72/86,880.80
  6. Step 6: Final answer
    x = 51,406.32

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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.