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Finding the Fourth Proportional to 281,113.40, 421,670.10 and 81,440.30

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Solution

The fourth proportional to 281,113.40, 421,670.10 and 81,440.30 is: 122,160.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,113.40 : 421,670.10 = 81,440.30 : x
  2. Step 2: Convert to fraction form
    281,113.40/421,670.10 = 81,440.30/x
  3. Step 3: Cross multiply
    281,113.40x = 421,670.10 × 81,440.30
  4. Step 4: Simplify right side
    281,113.40x = 34,340,939,445.03
  5. Step 5: Solve for x
    x = 34,340,939,445.03/281,113.40
  6. Step 6: Final answer
    x = 122,160.45

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1.5x scale

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.