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Finding the Fourth Proportional to 20,430.74, 30,639 and 7,281.20

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Solution

The fourth proportional to 20,430.74, 30,639 and 7,281.20 is: 10,919.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.74 : 30,639 = 7,281.20 : x
  2. Step 2: Convert to fraction form
    20,430.74/30,639 = 7,281.20/x
  3. Step 3: Cross multiply
    20,430.74x = 30,639 × 7,281.20
  4. Step 4: Simplify right side
    20,430.74x = 223,088,686.80
  5. Step 5: Solve for x
    x = 223,088,686.80/20,430.74
  6. Step 6: Final answer
    x = 10,919.27

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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.