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Finding the Fourth Proportional to 65,279.66, 90,079.13 and 38,420.55

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Solution

The fourth proportional to 65,279.66, 90,079.13 and 38,420.55 is: 53,016.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,279.66 : 90,079.13 = 38,420.55 : x
  2. Step 2: Convert to fraction form
    65,279.66/90,079.13 = 38,420.55/x
  3. Step 3: Cross multiply
    65,279.66x = 90,079.13 × 38,420.55
  4. Step 4: Simplify right side
    65,279.66x = 3,460,889,814.17
  5. Step 5: Solve for x
    x = 3,460,889,814.17/65,279.66
  6. Step 6: Final answer
    x = 53,016.36

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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.