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Finding the Fourth Proportional to 85,970.70, 128,846.70 and 76,566.60

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Solution

The fourth proportional to 85,970.70, 128,846.70 and 76,566.60 is: 114,752.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,970.70 : 128,846.70 = 76,566.60 : x
  2. Step 2: Convert to fraction form
    85,970.70/128,846.70 = 76,566.60/x
  3. Step 3: Cross multiply
    85,970.70x = 128,846.70 × 76,566.60
  4. Step 4: Simplify right side
    85,970.70x = 9,865,353,740.22
  5. Step 5: Solve for x
    x = 9,865,353,740.22/85,970.70
  6. Step 6: Final answer
    x = 114,752.51

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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.