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Finding the Fourth Proportional to 1,392.08, 2,101.20 and 1,392.08

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Solution

The fourth proportional to 1,392.08, 2,101.20 and 1,392.08 is: 2,101.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.08 : 2,101.20 = 1,392.08 : x
  2. Step 2: Convert to fraction form
    1,392.08/2,101.20 = 1,392.08/x
  3. Step 3: Cross multiply
    1,392.08x = 2,101.20 × 1,392.08
  4. Step 4: Simplify right side
    1,392.08x = 2,925,038.50
  5. Step 5: Solve for x
    x = 2,925,038.50/1,392.08
  6. Step 6: Final answer
    x = 2,101.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.