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Finding the Fourth Proportional to 388,959.96, 583,089.78 and 139,583.64

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Solution

The fourth proportional to 388,959.96, 583,089.78 and 139,583.64 is: 209,249.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,959.96 : 583,089.78 = 139,583.64 : x
  2. Step 2: Convert to fraction form
    388,959.96/583,089.78 = 139,583.64/x
  3. Step 3: Cross multiply
    388,959.96x = 583,089.78 × 139,583.64
  4. Step 4: Simplify right side
    388,959.96x = 81,389,793,939.20
  5. Step 5: Solve for x
    x = 81,389,793,939.20/388,959.96
  6. Step 6: Final answer
    x = 209,249.80

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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.