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Finding the Fourth Proportional to 54,281.70, 81,430.65 and 19,218.60

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Solution

The fourth proportional to 54,281.70, 81,430.65 and 19,218.60 is: 28,830.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,281.70 : 81,430.65 = 19,218.60 : x
  2. Step 2: Convert to fraction form
    54,281.70/81,430.65 = 19,218.60/x
  3. Step 3: Cross multiply
    54,281.70x = 81,430.65 × 19,218.60
  4. Step 4: Simplify right side
    54,281.70x = 1,564,983,090.09
  5. Step 5: Solve for x
    x = 1,564,983,090.09/54,281.70
  6. Step 6: Final answer
    x = 28,830.77

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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.