Home / 12,921.19-19,381.86-5,130

Finding the Fourth Proportional to 12,921.19, 19,381.86 and 5,130

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Solution

The fourth proportional to 12,921.19, 19,381.86 and 5,130 is: 7,695.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.19 : 19,381.86 = 5,130 : x
  2. Step 2: Convert to fraction form
    12,921.19/19,381.86 = 5,130/x
  3. Step 3: Cross multiply
    12,921.19x = 19,381.86 × 5,130
  4. Step 4: Simplify right side
    12,921.19x = 99,428,941.80
  5. Step 5: Solve for x
    x = 99,428,941.80/12,921.19
  6. Step 6: Final answer
    x = 7,695.03

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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.