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Finding the Fourth Proportional to 398,369.53, 549,703.59 and 243,242.78

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Solution

The fourth proportional to 398,369.53, 549,703.59 and 243,242.78 is: 335,646.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,369.53 : 549,703.59 = 243,242.78 : x
  2. Step 2: Convert to fraction form
    398,369.53/549,703.59 = 243,242.78/x
  3. Step 3: Cross multiply
    398,369.53x = 549,703.59 × 243,242.78
  4. Step 4: Simplify right side
    398,369.53x = 133,711,429,407.58
  5. Step 5: Solve for x
    x = 133,711,429,407.58/398,369.53
  6. Step 6: Final answer
    x = 335,646.73

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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.