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Finding the Fourth Proportional to 611,659.60, 917,489.40 and 399,083.20

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Solution

The fourth proportional to 611,659.60, 917,489.40 and 399,083.20 is: 598,624.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,659.60 : 917,489.40 = 399,083.20 : x
  2. Step 2: Convert to fraction form
    611,659.60/917,489.40 = 399,083.20/x
  3. Step 3: Cross multiply
    611,659.60x = 917,489.40 × 399,083.20
  4. Step 4: Simplify right side
    611,659.60x = 366,154,605,718.08
  5. Step 5: Solve for x
    x = 366,154,605,718.08/611,659.60
  6. Step 6: Final answer
    x = 598,624.80

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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.