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Finding the Fourth Proportional to 85,970.70, 128,769.08 and 52,589.79

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Solution

The fourth proportional to 85,970.70, 128,769.08 and 52,589.79 is: 78,770.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,970.70 : 128,769.08 = 52,589.79 : x
  2. Step 2: Convert to fraction form
    85,970.70/128,769.08 = 52,589.79/x
  3. Step 3: Cross multiply
    85,970.70x = 128,769.08 × 52,589.79
  4. Step 4: Simplify right side
    85,970.70x = 6,771,938,612.74
  5. Step 5: Solve for x
    x = 6,771,938,612.74/85,970.70
  6. Step 6: Final answer
    x = 78,770.31

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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.