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Finding the Fourth Proportional to 86,898.62, 130,127.34 and 72,821.64

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Solution

The fourth proportional to 86,898.62, 130,127.34 and 72,821.64 is: 109,047.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,898.62 : 130,127.34 = 72,821.64 : x
  2. Step 2: Convert to fraction form
    86,898.62/130,127.34 = 72,821.64/x
  3. Step 3: Cross multiply
    86,898.62x = 130,127.34 × 72,821.64
  4. Step 4: Simplify right side
    86,898.62x = 9,476,086,307.64
  5. Step 5: Solve for x
    x = 9,476,086,307.64/86,898.62
  6. Step 6: Final answer
    x = 109,047.60

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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.