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Finding the Fourth Proportional to 7,089.72, 9,783.64 and 3,945.84

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Solution

The fourth proportional to 7,089.72, 9,783.64 and 3,945.84 is: 5,445.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,089.72 : 9,783.64 = 3,945.84 : x
  2. Step 2: Convert to fraction form
    7,089.72/9,783.64 = 3,945.84/x
  3. Step 3: Cross multiply
    7,089.72x = 9,783.64 × 3,945.84
  4. Step 4: Simplify right side
    7,089.72x = 38,604,668.40
  5. Step 5: Solve for x
    x = 38,604,668.40/7,089.72
  6. Step 6: Final answer
    x = 5,445.16

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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.