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Finding the Fourth Proportional to 170,920.40, 256,207.80 and 77,493.20

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Solution

The fourth proportional to 170,920.40, 256,207.80 and 77,493.20 is: 116,161.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,920.40 : 256,207.80 = 77,493.20 : x
  2. Step 2: Convert to fraction form
    170,920.40/256,207.80 = 77,493.20/x
  3. Step 3: Cross multiply
    170,920.40x = 256,207.80 × 77,493.20
  4. Step 4: Simplify right side
    170,920.40x = 19,854,362,286.96
  5. Step 5: Solve for x
    x = 19,854,362,286.96/170,920.40
  6. Step 6: Final answer
    x = 116,161.45

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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.