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Finding the Fourth Proportional to 9,390.65, 12,945.29 and 7,148.63

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Solution

The fourth proportional to 9,390.65, 12,945.29 and 7,148.63 is: 9,854.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,390.65 : 12,945.29 = 7,148.63 : x
  2. Step 2: Convert to fraction form
    9,390.65/12,945.29 = 7,148.63/x
  3. Step 3: Cross multiply
    9,390.65x = 12,945.29 × 7,148.63
  4. Step 4: Simplify right side
    9,390.65x = 92,540,987.98
  5. Step 5: Solve for x
    x = 92,540,987.98/9,390.65
  6. Step 6: Final answer
    x = 9,854.59

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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.