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Finding the Fourth Proportional to 431,332.80, 646,999.20 and 218,756.40

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Solution

The fourth proportional to 431,332.80, 646,999.20 and 218,756.40 is: 328,134.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,332.80 : 646,999.20 = 218,756.40 : x
  2. Step 2: Convert to fraction form
    431,332.80/646,999.20 = 218,756.40/x
  3. Step 3: Cross multiply
    431,332.80x = 646,999.20 × 218,756.40
  4. Step 4: Simplify right side
    431,332.80x = 141,535,215,794.88
  5. Step 5: Solve for x
    x = 141,535,215,794.88/431,332.80
  6. Step 6: Final answer
    x = 328,134.60

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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.