Home / 21,005.39-28,989.48-15,690.98

Finding the Fourth Proportional to 21,005.39, 28,989.48 and 15,690.98

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Solution

The fourth proportional to 21,005.39, 28,989.48 and 15,690.98 is: 21,655.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.39 : 28,989.48 = 15,690.98 : x
  2. Step 2: Convert to fraction form
    21,005.39/28,989.48 = 15,690.98/x
  3. Step 3: Cross multiply
    21,005.39x = 28,989.48 × 15,690.98
  4. Step 4: Simplify right side
    21,005.39x = 454,873,127.49
  5. Step 5: Solve for x
    x = 454,873,127.49/21,005.39
  6. Step 6: Final answer
    x = 21,655.07

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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.