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Finding the Fourth Proportional to 13,505.40, 20,258.10 and 13,140.90

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Solution

The fourth proportional to 13,505.40, 20,258.10 and 13,140.90 is: 19,711.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,505.40 : 20,258.10 = 13,140.90 : x
  2. Step 2: Convert to fraction form
    13,505.40/20,258.10 = 13,140.90/x
  3. Step 3: Cross multiply
    13,505.40x = 20,258.10 × 13,140.90
  4. Step 4: Simplify right side
    13,505.40x = 266,209,666.29
  5. Step 5: Solve for x
    x = 266,209,666.29/13,505.40
  6. Step 6: Final answer
    x = 19,711.35

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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.