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Finding the Fourth Proportional to 55,875.60, 83,789.10 and 18,421.20

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Solution

The fourth proportional to 55,875.60, 83,789.10 and 18,421.20 is: 27,623.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,875.60 : 83,789.10 = 18,421.20 : x
  2. Step 2: Convert to fraction form
    55,875.60/83,789.10 = 18,421.20/x
  3. Step 3: Cross multiply
    55,875.60x = 83,789.10 × 18,421.20
  4. Step 4: Simplify right side
    55,875.60x = 1,543,495,768.92
  5. Step 5: Solve for x
    x = 1,543,495,768.92/55,875.60
  6. Step 6: Final answer
    x = 27,623.79

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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.