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Finding the Fourth Proportional to 386,417.60, 579,626.40 and 274,443.20

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Solution

The fourth proportional to 386,417.60, 579,626.40 and 274,443.20 is: 411,664.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,417.60 : 579,626.40 = 274,443.20 : x
  2. Step 2: Convert to fraction form
    386,417.60/579,626.40 = 274,443.20/x
  3. Step 3: Cross multiply
    386,417.60x = 579,626.40 × 274,443.20
  4. Step 4: Simplify right side
    386,417.60x = 159,074,524,020.48
  5. Step 5: Solve for x
    x = 159,074,524,020.48/386,417.60
  6. Step 6: Final answer
    x = 411,664.80

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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.