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Finding the Fourth Proportional to 8,918.36, 12,308.86 and 5,140.86

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Solution

The fourth proportional to 8,918.36, 12,308.86 and 5,140.86 is: 7,095.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.36 : 12,308.86 = 5,140.86 : x
  2. Step 2: Convert to fraction form
    8,918.36/12,308.86 = 5,140.86/x
  3. Step 3: Cross multiply
    8,918.36x = 12,308.86 × 5,140.86
  4. Step 4: Simplify right side
    8,918.36x = 63,278,126.02
  5. Step 5: Solve for x
    x = 63,278,126.02/8,918.36
  6. Step 6: Final answer
    x = 7,095.26

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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.