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Finding the Fourth Proportional to 485,393.71, 728,466.51 and 390,855.39

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Solution

The fourth proportional to 485,393.71, 728,466.51 and 390,855.39 is: 586,585.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,393.71 : 728,466.51 = 390,855.39 : x
  2. Step 2: Convert to fraction form
    485,393.71/728,466.51 = 390,855.39/x
  3. Step 3: Cross multiply
    485,393.71x = 728,466.51 × 390,855.39
  4. Step 4: Simplify right side
    485,393.71x = 284,725,061,867.99
  5. Step 5: Solve for x
    x = 284,725,061,867.99/485,393.71
  6. Step 6: Final answer
    x = 586,585.81

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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.