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Finding the Fourth Proportional to 128,428.70, 192,643.65 and 45,322.70

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Solution

The fourth proportional to 128,428.70, 192,643.65 and 45,322.70 is: 67,984.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,428.70 : 192,643.65 = 45,322.70 : x
  2. Step 2: Convert to fraction form
    128,428.70/192,643.65 = 45,322.70/x
  3. Step 3: Cross multiply
    128,428.70x = 192,643.65 × 45,322.70
  4. Step 4: Simplify right side
    128,428.70x = 8,731,130,355.86
  5. Step 5: Solve for x
    x = 8,731,130,355.86/128,428.70
  6. Step 6: Final answer
    x = 67,984.26

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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.