Home / 21,108.72-29,130.12-11,678.16

Finding the Fourth Proportional to 21,108.72, 29,130.12 and 11,678.16

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Solution

The fourth proportional to 21,108.72, 29,130.12 and 11,678.16 is: 16,115.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.72 : 29,130.12 = 11,678.16 : x
  2. Step 2: Convert to fraction form
    21,108.72/29,130.12 = 11,678.16/x
  3. Step 3: Cross multiply
    21,108.72x = 29,130.12 × 11,678.16
  4. Step 4: Simplify right side
    21,108.72x = 340,186,202.18
  5. Step 5: Solve for x
    x = 340,186,202.18/21,108.72
  6. Step 6: Final answer
    x = 16,115.91

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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.