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Finding the Fourth Proportional to 78,628.40, 117,950.88 and 45,347.72

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Solution

The fourth proportional to 78,628.40, 117,950.88 and 45,347.72 is: 68,026.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,628.40 : 117,950.88 = 45,347.72 : x
  2. Step 2: Convert to fraction form
    78,628.40/117,950.88 = 45,347.72/x
  3. Step 3: Cross multiply
    78,628.40x = 117,950.88 × 45,347.72
  4. Step 4: Simplify right side
    78,628.40x = 5,348,803,479.99
  5. Step 5: Solve for x
    x = 5,348,803,479.99/78,628.40
  6. Step 6: Final answer
    x = 68,026.36

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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.