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Finding the Fourth Proportional to 128,230.40, 192,311.04 and 86,931.20

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Solution

The fourth proportional to 128,230.40, 192,311.04 and 86,931.20 is: 130,373.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,230.40 : 192,311.04 = 86,931.20 : x
  2. Step 2: Convert to fraction form
    128,230.40/192,311.04 = 86,931.20/x
  3. Step 3: Cross multiply
    128,230.40x = 192,311.04 × 86,931.20
  4. Step 4: Simplify right side
    128,230.40x = 16,717,829,480.45
  5. Step 5: Solve for x
    x = 16,717,829,480.45/128,230.40
  6. Step 6: Final answer
    x = 130,373.37

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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.