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Finding the Fourth Proportional to 128,455.68, 192,643.68 and 45,330.24

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Solution

The fourth proportional to 128,455.68, 192,643.68 and 45,330.24 is: 67,981.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,455.68 : 192,643.68 = 45,330.24 : x
  2. Step 2: Convert to fraction form
    128,455.68/192,643.68 = 45,330.24/x
  3. Step 3: Cross multiply
    128,455.68x = 192,643.68 × 45,330.24
  4. Step 4: Simplify right side
    128,455.68x = 8,732,584,248.88
  5. Step 5: Solve for x
    x = 8,732,584,248.88/128,455.68
  6. Step 6: Final answer
    x = 67,981.30

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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.