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Finding the Fourth Proportional to 245,015.64, 367,290.18 and 78,687

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Solution

The fourth proportional to 245,015.64, 367,290.18 and 78,687 is: 117,955.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,015.64 : 367,290.18 = 78,687 : x
  2. Step 2: Convert to fraction form
    245,015.64/367,290.18 = 78,687/x
  3. Step 3: Cross multiply
    245,015.64x = 367,290.18 × 78,687
  4. Step 4: Simplify right side
    245,015.64x = 28,900,962,393.66
  5. Step 5: Solve for x
    x = 28,900,962,393.66/245,015.64
  6. Step 6: Final answer
    x = 117,955.58

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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.