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Finding the Fourth Proportional to 93,218.48, 128,690.19 and 72,756.60

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Solution

The fourth proportional to 93,218.48, 128,690.19 and 72,756.60 is: 100,442.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,218.48 : 128,690.19 = 72,756.60 : x
  2. Step 2: Convert to fraction form
    93,218.48/128,690.19 = 72,756.60/x
  3. Step 3: Cross multiply
    93,218.48x = 128,690.19 × 72,756.60
  4. Step 4: Simplify right side
    93,218.48x = 9,363,060,677.75
  5. Step 5: Solve for x
    x = 9,363,060,677.75/93,218.48
  6. Step 6: Final answer
    x = 100,442.11

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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.