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Finding the Fourth Proportional to 214,615.40, 321,980.70 and 191,402.60

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Solution

The fourth proportional to 214,615.40, 321,980.70 and 191,402.60 is: 287,155.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    214,615.40 : 321,980.70 = 191,402.60 : x
  2. Step 2: Convert to fraction form
    214,615.40/321,980.70 = 191,402.60/x
  3. Step 3: Cross multiply
    214,615.40x = 321,980.70 × 191,402.60
  4. Step 4: Simplify right side
    214,615.40x = 61,627,943,129.82
  5. Step 5: Solve for x
    x = 61,627,943,129.82/214,615.40
  6. Step 6: Final answer
    x = 287,155.27

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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.