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Finding the Fourth Proportional to 290,987.54, 436,499.75 and 91,315.81

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Solution

The fourth proportional to 290,987.54, 436,499.75 and 91,315.81 is: 136,979.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,987.54 : 436,499.75 = 91,315.81 : x
  2. Step 2: Convert to fraction form
    290,987.54/436,499.75 = 91,315.81/x
  3. Step 3: Cross multiply
    290,987.54x = 436,499.75 × 91,315.81
  4. Step 4: Simplify right side
    290,987.54x = 39,859,328,236.05
  5. Step 5: Solve for x
    x = 39,859,328,236.05/290,987.54
  6. Step 6: Final answer
    x = 136,979.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.