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Finding the Fourth Proportional to 386,617.60, 579,926.40 and 274,643.20

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Solution

The fourth proportional to 386,617.60, 579,926.40 and 274,643.20 is: 411,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,617.60 : 579,926.40 = 274,643.20 : x
  2. Step 2: Convert to fraction form
    386,617.60/579,926.40 = 274,643.20/x
  3. Step 3: Cross multiply
    386,617.60x = 579,926.40 × 274,643.20
  4. Step 4: Simplify right side
    386,617.60x = 159,272,842,260.48
  5. Step 5: Solve for x
    x = 159,272,842,260.48/386,617.60
  6. Step 6: Final answer
    x = 411,964.80

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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.