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Finding the Fourth Proportional to 79,700.18, 109,929.36 and 51,378.50

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Solution

The fourth proportional to 79,700.18, 109,929.36 and 51,378.50 is: 70,865.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,700.18 : 109,929.36 = 51,378.50 : x
  2. Step 2: Convert to fraction form
    79,700.18/109,929.36 = 51,378.50/x
  3. Step 3: Cross multiply
    79,700.18x = 109,929.36 × 51,378.50
  4. Step 4: Simplify right side
    79,700.18x = 5,648,005,622.76
  5. Step 5: Solve for x
    x = 5,648,005,622.76/79,700.18
  6. Step 6: Final answer
    x = 70,865.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.