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Finding the Fourth Proportional to 8,430.79, 12,642.24 and 2,505.50

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Solution

The fourth proportional to 8,430.79, 12,642.24 and 2,505.50 is: 3,757.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,430.79 : 12,642.24 = 2,505.50 : x
  2. Step 2: Convert to fraction form
    8,430.79/12,642.24 = 2,505.50/x
  3. Step 3: Cross multiply
    8,430.79x = 12,642.24 × 2,505.50
  4. Step 4: Simplify right side
    8,430.79x = 31,675,069.11
  5. Step 5: Solve for x
    x = 31,675,069.11/8,430.79
  6. Step 6: Final answer
    x = 3,757.07

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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.