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Finding the Fourth Proportional to 5,415.70, 8,123.55 and 5,342.80

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Solution

The fourth proportional to 5,415.70, 8,123.55 and 5,342.80 is: 8,014.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.70 : 8,123.55 = 5,342.80 : x
  2. Step 2: Convert to fraction form
    5,415.70/8,123.55 = 5,342.80/x
  3. Step 3: Cross multiply
    5,415.70x = 8,123.55 × 5,342.80
  4. Step 4: Simplify right side
    5,415.70x = 43,402,502.94
  5. Step 5: Solve for x
    x = 43,402,502.94/5,415.70
  6. Step 6: Final answer
    x = 8,014.20

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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.