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Finding the Fourth Proportional to 9,990.64, 14,992.65 and 4,147.25

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Solution

The fourth proportional to 9,990.64, 14,992.65 and 4,147.25 is: 6,223.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.64 : 14,992.65 = 4,147.25 : x
  2. Step 2: Convert to fraction form
    9,990.64/14,992.65 = 4,147.25/x
  3. Step 3: Cross multiply
    9,990.64x = 14,992.65 × 4,147.25
  4. Step 4: Simplify right side
    9,990.64x = 62,178,267.71
  5. Step 5: Solve for x
    x = 62,178,267.71/9,990.64
  6. Step 6: Final answer
    x = 6,223.65

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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.