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Finding the Fourth Proportional to 257,185.86, 385,637.84 and 79,643.58

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Solution

The fourth proportional to 257,185.86, 385,637.84 and 79,643.58 is: 119,421.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,185.86 : 385,637.84 = 79,643.58 : x
  2. Step 2: Convert to fraction form
    257,185.86/385,637.84 = 79,643.58/x
  3. Step 3: Cross multiply
    257,185.86x = 385,637.84 × 79,643.58
  4. Step 4: Simplify right side
    257,185.86x = 30,713,578,161.07
  5. Step 5: Solve for x
    x = 30,713,578,161.07/257,185.86
  6. Step 6: Final answer
    x = 119,421.72

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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.