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Finding the Fourth Proportional to 103,507.40, 155,259.90 and 72,986.84

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Solution

The fourth proportional to 103,507.40, 155,259.90 and 72,986.84 is: 109,479.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,507.40 : 155,259.90 = 72,986.84 : x
  2. Step 2: Convert to fraction form
    103,507.40/155,259.90 = 72,986.84/x
  3. Step 3: Cross multiply
    103,507.40x = 155,259.90 × 72,986.84
  4. Step 4: Simplify right side
    103,507.40x = 11,331,929,479.72
  5. Step 5: Solve for x
    x = 11,331,929,479.72/103,507.40
  6. Step 6: Final answer
    x = 109,479.41

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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.