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Finding the Fourth Proportional to 15,138.30, 21,210.90 and 15,138.30

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Solution

The fourth proportional to 15,138.30, 21,210.90 and 15,138.30 is: 21,210.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.30 : 21,210.90 = 15,138.30 : x
  2. Step 2: Convert to fraction form
    15,138.30/21,210.90 = 15,138.30/x
  3. Step 3: Cross multiply
    15,138.30x = 21,210.90 × 15,138.30
  4. Step 4: Simplify right side
    15,138.30x = 321,096,967.47
  5. Step 5: Solve for x
    x = 321,096,967.47/15,138.30
  6. Step 6: Final answer
    x = 21,210.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.