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Finding the Fourth Proportional to 103,615.70, 155,423.55 and 81,065.30

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Solution

The fourth proportional to 103,615.70, 155,423.55 and 81,065.30 is: 121,597.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,615.70 : 155,423.55 = 81,065.30 : x
  2. Step 2: Convert to fraction form
    103,615.70/155,423.55 = 81,065.30/x
  3. Step 3: Cross multiply
    103,615.70x = 155,423.55 × 81,065.30
  4. Step 4: Simplify right side
    103,615.70x = 12,599,456,707.82
  5. Step 5: Solve for x
    x = 12,599,456,707.82/103,615.70
  6. Step 6: Final answer
    x = 121,597.95

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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.