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Finding the Fourth Proportional to 72,618.51, 100,222.94 and 40,787.40

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Solution

The fourth proportional to 72,618.51, 100,222.94 and 40,787.40 is: 56,291.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,618.51 : 100,222.94 = 40,787.40 : x
  2. Step 2: Convert to fraction form
    72,618.51/100,222.94 = 40,787.40/x
  3. Step 3: Cross multiply
    72,618.51x = 100,222.94 × 40,787.40
  4. Step 4: Simplify right side
    72,618.51x = 4,087,832,939.02
  5. Step 5: Solve for x
    x = 4,087,832,939.02/72,618.51
  6. Step 6: Final answer
    x = 56,291.89

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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.