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Finding the Fourth Proportional to 398,706.80, 549,095.64 and 389,997.68

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Solution

The fourth proportional to 398,706.80, 549,095.64 and 389,997.68 is: 537,101.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,706.80 : 549,095.64 = 389,997.68 : x
  2. Step 2: Convert to fraction form
    398,706.80/549,095.64 = 389,997.68/x
  3. Step 3: Cross multiply
    398,706.80x = 549,095.64 × 389,997.68
  4. Step 4: Simplify right side
    398,706.80x = 214,146,025,698.12
  5. Step 5: Solve for x
    x = 214,146,025,698.12/398,706.80
  6. Step 6: Final answer
    x = 537,101.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.