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Finding the Fourth Proportional to 12,589.78, 17,373.85 and 7,000.78

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Solution

The fourth proportional to 12,589.78, 17,373.85 and 7,000.78 is: 9,661.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,589.78 : 17,373.85 = 7,000.78 : x
  2. Step 2: Convert to fraction form
    12,589.78/17,373.85 = 7,000.78/x
  3. Step 3: Cross multiply
    12,589.78x = 17,373.85 × 7,000.78
  4. Step 4: Simplify right side
    12,589.78x = 121,630,501.60
  5. Step 5: Solve for x
    x = 121,630,501.60/12,589.78
  6. Step 6: Final answer
    x = 9,661.05

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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.