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Finding the Fourth Proportional to 65,449, 90,316.38 and 39,925.90

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Solution

The fourth proportional to 65,449, 90,316.38 and 39,925.90 is: 55,095.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,449 : 90,316.38 = 39,925.90 : x
  2. Step 2: Convert to fraction form
    65,449/90,316.38 = 39,925.90/x
  3. Step 3: Cross multiply
    65,449x = 90,316.38 × 39,925.90
  4. Step 4: Simplify right side
    65,449x = 3,605,962,756.24
  5. Step 5: Solve for x
    x = 3,605,962,756.24/65,449
  6. Step 6: Final answer
    x = 55,095.77

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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.