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Finding the Fourth Proportional to 426,332.60, 639,729.30 and 189,711.80

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Solution

The fourth proportional to 426,332.60, 639,729.30 and 189,711.80 is: 284,670.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,332.60 : 639,729.30 = 189,711.80 : x
  2. Step 2: Convert to fraction form
    426,332.60/639,729.30 = 189,711.80/x
  3. Step 3: Cross multiply
    426,332.60x = 639,729.30 × 189,711.80
  4. Step 4: Simplify right side
    426,332.60x = 121,364,197,015.74
  5. Step 5: Solve for x
    x = 121,364,197,015.74/426,332.60
  6. Step 6: Final answer
    x = 284,670.22

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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.