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Finding the Fourth Proportional to 21,015.77, 28,993.65 and 13,460.90

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Solution

The fourth proportional to 21,015.77, 28,993.65 and 13,460.90 is: 18,570.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,015.77 : 28,993.65 = 13,460.90 : x
  2. Step 2: Convert to fraction form
    21,015.77/28,993.65 = 13,460.90/x
  3. Step 3: Cross multiply
    21,015.77x = 28,993.65 × 13,460.90
  4. Step 4: Simplify right side
    21,015.77x = 390,280,478.32
  5. Step 5: Solve for x
    x = 390,280,478.32/21,015.77
  6. Step 6: Final answer
    x = 18,570.84

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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.