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Finding the Fourth Proportional to 103,420.60, 155,130.90 and 92,145.40

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Solution

The fourth proportional to 103,420.60, 155,130.90 and 92,145.40 is: 138,218.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,420.60 : 155,130.90 = 92,145.40 : x
  2. Step 2: Convert to fraction form
    103,420.60/155,130.90 = 92,145.40/x
  3. Step 3: Cross multiply
    103,420.60x = 155,130.90 × 92,145.40
  4. Step 4: Simplify right side
    103,420.60x = 14,294,598,832.86
  5. Step 5: Solve for x
    x = 14,294,598,832.86/103,420.60
  6. Step 6: Final answer
    x = 138,218.10

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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.