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Finding the Fourth Proportional to 12,089.70, 18,129.93 and 4,693.20

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Solution

The fourth proportional to 12,089.70, 18,129.93 and 4,693.20 is: 7,038.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,089.70 : 18,129.93 = 4,693.20 : x
  2. Step 2: Convert to fraction form
    12,089.70/18,129.93 = 4,693.20/x
  3. Step 3: Cross multiply
    12,089.70x = 18,129.93 × 4,693.20
  4. Step 4: Simplify right side
    12,089.70x = 85,087,387.48
  5. Step 5: Solve for x
    x = 85,087,387.48/12,089.70
  6. Step 6: Final answer
    x = 7,038.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.