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Finding the Fourth Proportional to 103,503.20, 155,254.80 and 72,010.40

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Solution

The fourth proportional to 103,503.20, 155,254.80 and 72,010.40 is: 108,015.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,503.20 : 155,254.80 = 72,010.40 : x
  2. Step 2: Convert to fraction form
    103,503.20/155,254.80 = 72,010.40/x
  3. Step 3: Cross multiply
    103,503.20x = 155,254.80 × 72,010.40
  4. Step 4: Simplify right side
    103,503.20x = 11,179,960,249.92
  5. Step 5: Solve for x
    x = 11,179,960,249.92/103,503.20
  6. Step 6: Final answer
    x = 108,015.60

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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.