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Finding the Fourth Proportional to 45,971.31, 68,959.28 and 12,690.63

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Solution

The fourth proportional to 45,971.31, 68,959.28 and 12,690.63 is: 19,036.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,971.31 : 68,959.28 = 12,690.63 : x
  2. Step 2: Convert to fraction form
    45,971.31/68,959.28 = 12,690.63/x
  3. Step 3: Cross multiply
    45,971.31x = 68,959.28 × 12,690.63
  4. Step 4: Simplify right side
    45,971.31x = 875,136,707.55
  5. Step 5: Solve for x
    x = 875,136,707.55/45,971.31
  6. Step 6: Final answer
    x = 19,036.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.