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Finding the Fourth Proportional to 72,690.54, 100,312.40 and 40,859.57

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Solution

The fourth proportional to 72,690.54, 100,312.40 and 40,859.57 is: 56,385.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,690.54 : 100,312.40 = 40,859.57 : x
  2. Step 2: Convert to fraction form
    72,690.54/100,312.40 = 40,859.57/x
  3. Step 3: Cross multiply
    72,690.54x = 100,312.40 × 40,859.57
  4. Step 4: Simplify right side
    72,690.54x = 4,098,720,823.81
  5. Step 5: Solve for x
    x = 4,098,720,823.81/72,690.54
  6. Step 6: Final answer
    x = 56,385.89

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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.