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Finding the Fourth Proportional to 326,440.32, 489,604.05 and 86,555.76

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Solution

The fourth proportional to 326,440.32, 489,604.05 and 86,555.76 is: 129,818.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,440.32 : 489,604.05 = 86,555.76 : x
  2. Step 2: Convert to fraction form
    326,440.32/489,604.05 = 86,555.76/x
  3. Step 3: Cross multiply
    326,440.32x = 489,604.05 × 86,555.76
  4. Step 4: Simplify right side
    326,440.32x = 42,378,050,646.83
  5. Step 5: Solve for x
    x = 42,378,050,646.83/326,440.32
  6. Step 6: Final answer
    x = 129,818.68

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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.