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Finding the Fourth Proportional to 80,585.40, 120,878.10 and 21,430.20

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Solution

The fourth proportional to 80,585.40, 120,878.10 and 21,430.20 is: 32,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,585.40 : 120,878.10 = 21,430.20 : x
  2. Step 2: Convert to fraction form
    80,585.40/120,878.10 = 21,430.20/x
  3. Step 3: Cross multiply
    80,585.40x = 120,878.10 × 21,430.20
  4. Step 4: Simplify right side
    80,585.40x = 2,590,441,858.62
  5. Step 5: Solve for x
    x = 2,590,441,858.62/80,585.40
  6. Step 6: Final answer
    x = 32,145.30

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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.