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Finding the Fourth Proportional to 65,948.22, 90,995.13 and 39,078.90

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Solution

The fourth proportional to 65,948.22, 90,995.13 and 39,078.90 is: 53,920.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,948.22 : 90,995.13 = 39,078.90 : x
  2. Step 2: Convert to fraction form
    65,948.22/90,995.13 = 39,078.90/x
  3. Step 3: Cross multiply
    65,948.22x = 90,995.13 × 39,078.90
  4. Step 4: Simplify right side
    65,948.22x = 3,555,989,585.76
  5. Step 5: Solve for x
    x = 3,555,989,585.76/65,948.22
  6. Step 6: Final answer
    x = 53,920.93

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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.