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Finding the Fourth Proportional to 54,479.31, 81,700.40 and 18,931.22

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Solution

The fourth proportional to 54,479.31, 81,700.40 and 18,931.22 is: 28,390.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,479.31 : 81,700.40 = 18,931.22 : x
  2. Step 2: Convert to fraction form
    54,479.31/81,700.40 = 18,931.22/x
  3. Step 3: Cross multiply
    54,479.31x = 81,700.40 × 18,931.22
  4. Step 4: Simplify right side
    54,479.31x = 1,546,688,085.20
  5. Step 5: Solve for x
    x = 1,546,688,085.20/54,479.31
  6. Step 6: Final answer
    x = 28,390.38

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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.