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Finding the Fourth Proportional to 100,885.50, 139,221.99 and 58,468.64

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Solution

The fourth proportional to 100,885.50, 139,221.99 and 58,468.64 is: 80,686.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,885.50 : 139,221.99 = 58,468.64 : x
  2. Step 2: Convert to fraction form
    100,885.50/139,221.99 = 58,468.64/x
  3. Step 3: Cross multiply
    100,885.50x = 139,221.99 × 58,468.64
  4. Step 4: Simplify right side
    100,885.50x = 8,140,119,717.28
  5. Step 5: Solve for x
    x = 8,140,119,717.28/100,885.50
  6. Step 6: Final answer
    x = 80,686.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.