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Finding the Fourth Proportional to 256,870.40, 385,165.56 and 79,344.32

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Solution

The fourth proportional to 256,870.40, 385,165.56 and 79,344.32 is: 118,973.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,870.40 : 385,165.56 = 79,344.32 : x
  2. Step 2: Convert to fraction form
    256,870.40/385,165.56 = 79,344.32/x
  3. Step 3: Cross multiply
    256,870.40x = 385,165.56 × 79,344.32
  4. Step 4: Simplify right side
    256,870.40x = 30,560,699,445.62
  5. Step 5: Solve for x
    x = 30,560,699,445.62/256,870.40
  6. Step 6: Final answer
    x = 118,973.22

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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.