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Finding the Fourth Proportional to 8,970.64, 12,379.54 and 4,991.38

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Solution

The fourth proportional to 8,970.64, 12,379.54 and 4,991.38 is: 6,888.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,970.64 : 12,379.54 = 4,991.38 : x
  2. Step 2: Convert to fraction form
    8,970.64/12,379.54 = 4,991.38/x
  3. Step 3: Cross multiply
    8,970.64x = 12,379.54 × 4,991.38
  4. Step 4: Simplify right side
    8,970.64x = 61,790,988.37
  5. Step 5: Solve for x
    x = 61,790,988.37/8,970.64
  6. Step 6: Final answer
    x = 6,888.14

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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.