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Finding the Fourth Proportional to 8,907.30, 12,289.77 and 5,320.79

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Solution

The fourth proportional to 8,907.30, 12,289.77 and 5,320.79 is: 7,341.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,907.30 : 12,289.77 = 5,320.79 : x
  2. Step 2: Convert to fraction form
    8,907.30/12,289.77 = 5,320.79/x
  3. Step 3: Cross multiply
    8,907.30x = 12,289.77 × 5,320.79
  4. Step 4: Simplify right side
    8,907.30x = 65,391,273.05
  5. Step 5: Solve for x
    x = 65,391,273.05/8,907.30
  6. Step 6: Final answer
    x = 7,341.31

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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.