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Finding the Fourth Proportional to 80,405.40, 120,489.30 and 58,265.40

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Solution

The fourth proportional to 80,405.40, 120,489.30 and 58,265.40 is: 87,312.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,405.40 : 120,489.30 = 58,265.40 : x
  2. Step 2: Convert to fraction form
    80,405.40/120,489.30 = 58,265.40/x
  3. Step 3: Cross multiply
    80,405.40x = 120,489.30 × 58,265.40
  4. Step 4: Simplify right side
    80,405.40x = 7,020,357,260.22
  5. Step 5: Solve for x
    x = 7,020,357,260.22/80,405.40
  6. Step 6: Final answer
    x = 87,312.01

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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.