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Finding the Fourth Proportional to 85,415.70, 128,123.55 and 81,527.70

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Solution

The fourth proportional to 85,415.70, 128,123.55 and 81,527.70 is: 122,291.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,415.70 : 128,123.55 = 81,527.70 : x
  2. Step 2: Convert to fraction form
    85,415.70/128,123.55 = 81,527.70/x
  3. Step 3: Cross multiply
    85,415.70x = 128,123.55 × 81,527.70
  4. Step 4: Simplify right side
    85,415.70x = 10,445,618,347.34
  5. Step 5: Solve for x
    x = 10,445,618,347.34/85,415.70
  6. Step 6: Final answer
    x = 122,291.55

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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.