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Finding the Fourth Proportional to 15,507.77, 21,402.77 and 15,085.58

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Solution

The fourth proportional to 15,507.77, 21,402.77 and 15,085.58 is: 20,820.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,507.77 : 21,402.77 = 15,085.58 : x
  2. Step 2: Convert to fraction form
    15,507.77/21,402.77 = 15,085.58/x
  3. Step 3: Cross multiply
    15,507.77x = 21,402.77 × 15,085.58
  4. Step 4: Simplify right side
    15,507.77x = 322,873,199.06
  5. Step 5: Solve for x
    x = 322,873,199.06/15,507.77
  6. Step 6: Final answer
    x = 20,820.09

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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.