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Finding the Fourth Proportional to 81,811.40, 122,717.10 and 42,445.40

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Solution

The fourth proportional to 81,811.40, 122,717.10 and 42,445.40 is: 63,668.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,811.40 : 122,717.10 = 42,445.40 : x
  2. Step 2: Convert to fraction form
    81,811.40/122,717.10 = 42,445.40/x
  3. Step 3: Cross multiply
    81,811.40x = 122,717.10 × 42,445.40
  4. Step 4: Simplify right side
    81,811.40x = 5,208,776,396.34
  5. Step 5: Solve for x
    x = 5,208,776,396.34/81,811.40
  6. Step 6: Final answer
    x = 63,668.10

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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.