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Finding the Fourth Proportional to 338,798.90, 508,295.55 and 128,458.10

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Solution

The fourth proportional to 338,798.90, 508,295.55 and 128,458.10 is: 192,724.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,798.90 : 508,295.55 = 128,458.10 : x
  2. Step 2: Convert to fraction form
    338,798.90/508,295.55 = 128,458.10/x
  3. Step 3: Cross multiply
    338,798.90x = 508,295.55 × 128,458.10
  4. Step 4: Simplify right side
    338,798.90x = 65,294,682,343.91
  5. Step 5: Solve for x
    x = 65,294,682,343.91/338,798.90
  6. Step 6: Final answer
    x = 192,724.01

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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.