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Finding the Fourth Proportional to 18,751.70, 28,130.70 and 5,605.40

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Solution

The fourth proportional to 18,751.70, 28,130.70 and 5,605.40 is: 8,409.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.70 : 28,130.70 = 5,605.40 : x
  2. Step 2: Convert to fraction form
    18,751.70/28,130.70 = 5,605.40/x
  3. Step 3: Cross multiply
    18,751.70x = 28,130.70 × 5,605.40
  4. Step 4: Simplify right side
    18,751.70x = 157,683,825.78
  5. Step 5: Solve for x
    x = 157,683,825.78/18,751.70
  6. Step 6: Final answer
    x = 8,409.04

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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.