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Finding the Fourth Proportional to 20,987.76, 28,964.75 and 11,558.01

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Solution

The fourth proportional to 20,987.76, 28,964.75 and 11,558.01 is: 15,950.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.76 : 28,964.75 = 11,558.01 : x
  2. Step 2: Convert to fraction form
    20,987.76/28,964.75 = 11,558.01/x
  3. Step 3: Cross multiply
    20,987.76x = 28,964.75 × 11,558.01
  4. Step 4: Simplify right side
    20,987.76x = 334,774,812.36
  5. Step 5: Solve for x
    x = 334,774,812.36/20,987.76
  6. Step 6: Final answer
    x = 15,950.95

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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.