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Finding the Fourth Proportional to 290,867.40, 436,300.29 and 91,188.63

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Solution

The fourth proportional to 290,867.40, 436,300.29 and 91,188.63 is: 136,782.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,867.40 : 436,300.29 = 91,188.63 : x
  2. Step 2: Convert to fraction form
    290,867.40/436,300.29 = 91,188.63/x
  3. Step 3: Cross multiply
    290,867.40x = 436,300.29 × 91,188.63
  4. Step 4: Simplify right side
    290,867.40x = 39,785,625,713.70
  5. Step 5: Solve for x
    x = 39,785,625,713.70/290,867.40
  6. Step 6: Final answer
    x = 136,782.69

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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.