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Finding the Fourth Proportional to 405,318.66, 558,967.80 and 243,893.40

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Solution

The fourth proportional to 405,318.66, 558,967.80 and 243,893.40 is: 336,349.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,318.66 : 558,967.80 = 243,893.40 : x
  2. Step 2: Convert to fraction form
    405,318.66/558,967.80 = 243,893.40/x
  3. Step 3: Cross multiply
    405,318.66x = 558,967.80 × 243,893.40
  4. Step 4: Simplify right side
    405,318.66x = 136,328,557,232.52
  5. Step 5: Solve for x
    x = 136,328,557,232.52/405,318.66
  6. Step 6: Final answer
    x = 336,349.08

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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.