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Finding the Fourth Proportional to 2,128.63, 2,929.20 and 2,070.31

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Solution

The fourth proportional to 2,128.63, 2,929.20 and 2,070.31 is: 2,848.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.63 : 2,929.20 = 2,070.31 : x
  2. Step 2: Convert to fraction form
    2,128.63/2,929.20 = 2,070.31/x
  3. Step 3: Cross multiply
    2,128.63x = 2,929.20 × 2,070.31
  4. Step 4: Simplify right side
    2,128.63x = 6,064,352.05
  5. Step 5: Solve for x
    x = 6,064,352.05/2,128.63
  6. Step 6: Final answer
    x = 2,848.95

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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.