Home / 428,826.80-643,931.40-323,764.40

Finding the Fourth Proportional to 428,826.80, 643,931.40 and 323,764.40

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Solution

The fourth proportional to 428,826.80, 643,931.40 and 323,764.40 is: 486,168.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,826.80 : 643,931.40 = 323,764.40 : x
  2. Step 2: Convert to fraction form
    428,826.80/643,931.40 = 323,764.40/x
  3. Step 3: Cross multiply
    428,826.80x = 643,931.40 × 323,764.40
  4. Step 4: Simplify right side
    428,826.80x = 208,482,063,362.16
  5. Step 5: Solve for x
    x = 208,482,063,362.16/428,826.80
  6. Step 6: Final answer
    x = 486,168.46

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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.