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Finding the Fourth Proportional to 103,503.70, 155,255.55 and 99,421.30

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Solution

The fourth proportional to 103,503.70, 155,255.55 and 99,421.30 is: 149,131.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,503.70 : 155,255.55 = 99,421.30 : x
  2. Step 2: Convert to fraction form
    103,503.70/155,255.55 = 99,421.30/x
  3. Step 3: Cross multiply
    103,503.70x = 155,255.55 × 99,421.30
  4. Step 4: Simplify right side
    103,503.70x = 15,435,708,613.22
  5. Step 5: Solve for x
    x = 15,435,708,613.22/103,503.70
  6. Step 6: Final answer
    x = 149,131.95

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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.