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Finding the Fourth Proportional to 418,468.80, 627,703.20 and 208,516.80

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Solution

The fourth proportional to 418,468.80, 627,703.20 and 208,516.80 is: 312,775.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,468.80 : 627,703.20 = 208,516.80 : x
  2. Step 2: Convert to fraction form
    418,468.80/627,703.20 = 208,516.80/x
  3. Step 3: Cross multiply
    418,468.80x = 627,703.20 × 208,516.80
  4. Step 4: Simplify right side
    418,468.80x = 130,886,662,613.76
  5. Step 5: Solve for x
    x = 130,886,662,613.76/418,468.80
  6. Step 6: Final answer
    x = 312,775.20

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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.