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Finding the Fourth Proportional to 103,504.60, 155,256.90 and 86,008.60

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Solution

The fourth proportional to 103,504.60, 155,256.90 and 86,008.60 is: 129,012.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,504.60 : 155,256.90 = 86,008.60 : x
  2. Step 2: Convert to fraction form
    103,504.60/155,256.90 = 86,008.60/x
  3. Step 3: Cross multiply
    103,504.60x = 155,256.90 × 86,008.60
  4. Step 4: Simplify right side
    103,504.60x = 13,353,428,609.34
  5. Step 5: Solve for x
    x = 13,353,428,609.34/103,504.60
  6. Step 6: Final answer
    x = 129,012.90

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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.