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Finding the Fourth Proportional to 128,410.90, 192,421.95 and 86,809.30

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Solution

The fourth proportional to 128,410.90, 192,421.95 and 86,809.30 is: 130,082.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,410.90 : 192,421.95 = 86,809.30 : x
  2. Step 2: Convert to fraction form
    128,410.90/192,421.95 = 86,809.30/x
  3. Step 3: Cross multiply
    128,410.90x = 192,421.95 × 86,809.30
  4. Step 4: Simplify right side
    128,410.90x = 16,704,014,784.14
  5. Step 5: Solve for x
    x = 16,704,014,784.14/128,410.90
  6. Step 6: Final answer
    x = 130,082.53

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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.