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Finding the Fourth Proportional to 394,718.71, 592,085.40 and 128,478.19

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Solution

The fourth proportional to 394,718.71, 592,085.40 and 128,478.19 is: 192,719.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,718.71 : 592,085.40 = 128,478.19 : x
  2. Step 2: Convert to fraction form
    394,718.71/592,085.40 = 128,478.19/x
  3. Step 3: Cross multiply
    394,718.71x = 592,085.40 × 128,478.19
  4. Step 4: Simplify right side
    394,718.71x = 76,070,060,517.43
  5. Step 5: Solve for x
    x = 76,070,060,517.43/394,718.71
  6. Step 6: Final answer
    x = 192,719.67

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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.