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Finding the Fourth Proportional to 65,464.74, 90,349.77 and 39,965.76

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Solution

The fourth proportional to 65,464.74, 90,349.77 and 39,965.76 is: 55,157.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,464.74 : 90,349.77 = 39,965.76 : x
  2. Step 2: Convert to fraction form
    65,464.74/90,349.77 = 39,965.76/x
  3. Step 3: Cross multiply
    65,464.74x = 90,349.77 × 39,965.76
  4. Step 4: Simplify right side
    65,464.74x = 3,610,897,223.88
  5. Step 5: Solve for x
    x = 3,610,897,223.88/65,464.74
  6. Step 6: Final answer
    x = 55,157.89

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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.