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Finding the Fourth Proportional to 281,145.40, 421,718.10 and 81,472.30

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Solution

The fourth proportional to 281,145.40, 421,718.10 and 81,472.30 is: 122,208.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,145.40 : 421,718.10 = 81,472.30 : x
  2. Step 2: Convert to fraction form
    281,145.40/421,718.10 = 81,472.30/x
  3. Step 3: Cross multiply
    281,145.40x = 421,718.10 × 81,472.30
  4. Step 4: Simplify right side
    281,145.40x = 34,358,343,558.63
  5. Step 5: Solve for x
    x = 34,358,343,558.63/281,145.40
  6. Step 6: Final answer
    x = 122,208.45

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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.