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Finding the Fourth Proportional to 19,720.80, 29,624.40 and 18,986.40

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Solution

The fourth proportional to 19,720.80, 29,624.40 and 18,986.40 is: 28,521.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.80 : 29,624.40 = 18,986.40 : x
  2. Step 2: Convert to fraction form
    19,720.80/29,624.40 = 18,986.40/x
  3. Step 3: Cross multiply
    19,720.80x = 29,624.40 × 18,986.40
  4. Step 4: Simplify right side
    19,720.80x = 562,460,708.16
  5. Step 5: Solve for x
    x = 562,460,708.16/19,720.80
  6. Step 6: Final answer
    x = 28,521.19

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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.