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Finding the Fourth Proportional to 399,990.40, 599,985.60 and 390,659.20

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Solution

The fourth proportional to 399,990.40, 599,985.60 and 390,659.20 is: 585,988.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,990.40 : 599,985.60 = 390,659.20 : x
  2. Step 2: Convert to fraction form
    399,990.40/599,985.60 = 390,659.20/x
  3. Step 3: Cross multiply
    399,990.40x = 599,985.60 × 390,659.20
  4. Step 4: Simplify right side
    399,990.40x = 234,389,894,507.52
  5. Step 5: Solve for x
    x = 234,389,894,507.52/399,990.40
  6. Step 6: Final answer
    x = 585,988.80

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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.