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Finding the Fourth Proportional to 208,231.40, 312,347.10 and 89,820.20

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Solution

The fourth proportional to 208,231.40, 312,347.10 and 89,820.20 is: 134,730.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,231.40 : 312,347.10 = 89,820.20 : x
  2. Step 2: Convert to fraction form
    208,231.40/312,347.10 = 89,820.20/x
  3. Step 3: Cross multiply
    208,231.40x = 312,347.10 × 89,820.20
  4. Step 4: Simplify right side
    208,231.40x = 28,055,078,991.42
  5. Step 5: Solve for x
    x = 28,055,078,991.42/208,231.40
  6. Step 6: Final answer
    x = 134,730.30

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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.