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Finding the Fourth Proportional to 78,419.40, 108,218.58 and 42,609.55

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Solution

The fourth proportional to 78,419.40, 108,218.58 and 42,609.55 is: 58,801.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,419.40 : 108,218.58 = 42,609.55 : x
  2. Step 2: Convert to fraction form
    78,419.40/108,218.58 = 42,609.55/x
  3. Step 3: Cross multiply
    78,419.40x = 108,218.58 × 42,609.55
  4. Step 4: Simplify right side
    78,419.40x = 4,611,144,995.44
  5. Step 5: Solve for x
    x = 4,611,144,995.44/78,419.40
  6. Step 6: Final answer
    x = 58,801.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.