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Finding the Fourth Proportional to 8,958.65, 12,359.66 and 5,420.57

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Solution

The fourth proportional to 8,958.65, 12,359.66 and 5,420.57 is: 7,478.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,958.65 : 12,359.66 = 5,420.57 : x
  2. Step 2: Convert to fraction form
    8,958.65/12,359.66 = 5,420.57/x
  3. Step 3: Cross multiply
    8,958.65x = 12,359.66 × 5,420.57
  4. Step 4: Simplify right side
    8,958.65x = 66,996,313.31
  5. Step 5: Solve for x
    x = 66,996,313.31/8,958.65
  6. Step 6: Final answer
    x = 7,478.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.