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Finding the Fourth Proportional to 65,412.90, 90,279.63 and 39,934.06

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Solution

The fourth proportional to 65,412.90, 90,279.63 and 39,934.06 is: 55,115.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,412.90 : 90,279.63 = 39,934.06 : x
  2. Step 2: Convert to fraction form
    65,412.90/90,279.63 = 39,934.06/x
  3. Step 3: Cross multiply
    65,412.90x = 90,279.63 × 39,934.06
  4. Step 4: Simplify right side
    65,412.90x = 3,605,232,443.32
  5. Step 5: Solve for x
    x = 3,605,232,443.32/65,412.90
  6. Step 6: Final answer
    x = 55,115.01

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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.