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Finding the Fourth Proportional to 15,140.80, 21,214.40 and 15,140.80

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Solution

The fourth proportional to 15,140.80, 21,214.40 and 15,140.80 is: 21,214.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,140.80 : 21,214.40 = 15,140.80 : x
  2. Step 2: Convert to fraction form
    15,140.80/21,214.40 = 15,140.80/x
  3. Step 3: Cross multiply
    15,140.80x = 21,214.40 × 15,140.80
  4. Step 4: Simplify right side
    15,140.80x = 321,202,987.52
  5. Step 5: Solve for x
    x = 321,202,987.52/15,140.80
  6. Step 6: Final answer
    x = 21,214.40

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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.