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Finding the Fourth Proportional to 65,279.79, 90,069.98 and 38,420.19

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Solution

The fourth proportional to 65,279.79, 90,069.98 and 38,420.19 is: 53,010.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,279.79 : 90,069.98 = 38,420.19 : x
  2. Step 2: Convert to fraction form
    65,279.79/90,069.98 = 38,420.19/x
  3. Step 3: Cross multiply
    65,279.79x = 90,069.98 × 38,420.19
  4. Step 4: Simplify right side
    65,279.79x = 3,460,505,552.80
  5. Step 5: Solve for x
    x = 3,460,505,552.80/65,279.79
  6. Step 6: Final answer
    x = 53,010.37

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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.