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Finding the Fourth Proportional to 79,688.70, 109,957.68 and 45,690.66

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Solution

The fourth proportional to 79,688.70, 109,957.68 and 45,690.66 is: 63,045.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,688.70 : 109,957.68 = 45,690.66 : x
  2. Step 2: Convert to fraction form
    79,688.70/109,957.68 = 45,690.66/x
  3. Step 3: Cross multiply
    79,688.70x = 109,957.68 × 45,690.66
  4. Step 4: Simplify right side
    79,688.70x = 5,024,038,971.27
  5. Step 5: Solve for x
    x = 5,024,038,971.27/79,688.70
  6. Step 6: Final answer
    x = 63,045.81

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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.