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Finding the Fourth Proportional to 9,809.60, 14,720.70 and 5,430.20

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Solution

The fourth proportional to 9,809.60, 14,720.70 and 5,430.20 is: 8,148.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,809.60 : 14,720.70 = 5,430.20 : x
  2. Step 2: Convert to fraction form
    9,809.60/14,720.70 = 5,430.20/x
  3. Step 3: Cross multiply
    9,809.60x = 14,720.70 × 5,430.20
  4. Step 4: Simplify right side
    9,809.60x = 79,936,345.14
  5. Step 5: Solve for x
    x = 79,936,345.14/9,809.60
  6. Step 6: Final answer
    x = 8,148.79

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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.