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Finding the Fourth Proportional to 393,428.80, 590,143.20 and 144,078.40

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Solution

The fourth proportional to 393,428.80, 590,143.20 and 144,078.40 is: 216,117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,428.80 : 590,143.20 = 144,078.40 : x
  2. Step 2: Convert to fraction form
    393,428.80/590,143.20 = 144,078.40/x
  3. Step 3: Cross multiply
    393,428.80x = 590,143.20 × 144,078.40
  4. Step 4: Simplify right side
    393,428.80x = 85,026,888,026.88
  5. Step 5: Solve for x
    x = 85,026,888,026.88/393,428.80
  6. Step 6: Final answer
    x = 216,117.60

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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.