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Finding the Fourth Proportional to 93,415.57, 128,879.79 and 71,911.89

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Solution

The fourth proportional to 93,415.57, 128,879.79 and 71,911.89 is: 99,212.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,415.57 : 128,879.79 = 71,911.89 : x
  2. Step 2: Convert to fraction form
    93,415.57/128,879.79 = 71,911.89/x
  3. Step 3: Cross multiply
    93,415.57x = 128,879.79 × 71,911.89
  4. Step 4: Simplify right side
    93,415.57x = 9,267,989,281.70
  5. Step 5: Solve for x
    x = 9,267,989,281.70/93,415.57
  6. Step 6: Final answer
    x = 99,212.47

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1.5x scale

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.