Home / 21,168.78-29,213.10-13,210.53

Finding the Fourth Proportional to 21,168.78, 29,213.10 and 13,210.53

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Solution

The fourth proportional to 21,168.78, 29,213.10 and 13,210.53 is: 18,230.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168.78 : 29,213.10 = 13,210.53 : x
  2. Step 2: Convert to fraction form
    21,168.78/29,213.10 = 13,210.53/x
  3. Step 3: Cross multiply
    21,168.78x = 29,213.10 × 13,210.53
  4. Step 4: Simplify right side
    21,168.78x = 385,920,533.94
  5. Step 5: Solve for x
    x = 385,920,533.94/21,168.78
  6. Step 6: Final answer
    x = 18,230.65

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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.