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Finding the Fourth Proportional to 72,230.94, 99,688.14 and 40,406.40

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Solution

The fourth proportional to 72,230.94, 99,688.14 and 40,406.40 is: 55,766.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,230.94 : 99,688.14 = 40,406.40 : x
  2. Step 2: Convert to fraction form
    72,230.94/99,688.14 = 40,406.40/x
  3. Step 3: Cross multiply
    72,230.94x = 99,688.14 × 40,406.40
  4. Step 4: Simplify right side
    72,230.94x = 4,028,038,860.10
  5. Step 5: Solve for x
    x = 4,028,038,860.10/72,230.94
  6. Step 6: Final answer
    x = 55,766.11

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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.