Home / 20,985.84-28,961.28-11,555.28

Finding the Fourth Proportional to 20,985.84, 28,961.28 and 11,555.28

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Solution

The fourth proportional to 20,985.84, 28,961.28 and 11,555.28 is: 15,946.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.84 : 28,961.28 = 11,555.28 : x
  2. Step 2: Convert to fraction form
    20,985.84/28,961.28 = 11,555.28/x
  3. Step 3: Cross multiply
    20,985.84x = 28,961.28 × 11,555.28
  4. Step 4: Simplify right side
    20,985.84x = 334,655,699.56
  5. Step 5: Solve for x
    x = 334,655,699.56/20,985.84
  6. Step 6: Final answer
    x = 15,946.74

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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.