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Finding the Fourth Proportional to 9,377.58, 12,940.65 and 5,128.53

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Solution

The fourth proportional to 9,377.58, 12,940.65 and 5,128.53 is: 7,077.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,377.58 : 12,940.65 = 5,128.53 : x
  2. Step 2: Convert to fraction form
    9,377.58/12,940.65 = 5,128.53/x
  3. Step 3: Cross multiply
    9,377.58x = 12,940.65 × 5,128.53
  4. Step 4: Simplify right side
    9,377.58x = 66,366,511.74
  5. Step 5: Solve for x
    x = 66,366,511.74/9,377.58
  6. Step 6: Final answer
    x = 7,077.15

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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.