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Finding the Fourth Proportional to 72,153.10, 99,570.99 and 40,321.99

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Solution

The fourth proportional to 72,153.10, 99,570.99 and 40,321.99 is: 55,644.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,153.10 : 99,570.99 = 40,321.99 : x
  2. Step 2: Convert to fraction form
    72,153.10/99,570.99 = 40,321.99/x
  3. Step 3: Cross multiply
    72,153.10x = 99,570.99 × 40,321.99
  4. Step 4: Simplify right side
    72,153.10x = 4,014,900,463.07
  5. Step 5: Solve for x
    x = 4,014,900,463.07/72,153.10
  6. Step 6: Final answer
    x = 55,644.19

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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.