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Finding the Fourth Proportional to 13,858.90, 19,123.08 and 7,890.68

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Solution

The fourth proportional to 13,858.90, 19,123.08 and 7,890.68 is: 10,887.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,858.90 : 19,123.08 = 7,890.68 : x
  2. Step 2: Convert to fraction form
    13,858.90/19,123.08 = 7,890.68/x
  3. Step 3: Cross multiply
    13,858.90x = 19,123.08 × 7,890.68
  4. Step 4: Simplify right side
    13,858.90x = 150,894,152.70
  5. Step 5: Solve for x
    x = 150,894,152.70/13,858.90
  6. Step 6: Final answer
    x = 10,887.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.