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Finding the Fourth Proportional to 65,341.56, 90,138.12 and 42,693.80

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Solution

The fourth proportional to 65,341.56, 90,138.12 and 42,693.80 is: 58,895.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,341.56 : 90,138.12 = 42,693.80 : x
  2. Step 2: Convert to fraction form
    65,341.56/90,138.12 = 42,693.80/x
  3. Step 3: Cross multiply
    65,341.56x = 90,138.12 × 42,693.80
  4. Step 4: Simplify right side
    65,341.56x = 3,848,338,867.66
  5. Step 5: Solve for x
    x = 3,848,338,867.66/65,341.56
  6. Step 6: Final answer
    x = 58,895.73

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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.