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Finding the Fourth Proportional to 290,987.98, 436,500.42 and 91,316.26

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Solution

The fourth proportional to 290,987.98, 436,500.42 and 91,316.26 is: 136,980.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,987.98 : 436,500.42 = 91,316.26 : x
  2. Step 2: Convert to fraction form
    290,987.98/436,500.42 = 91,316.26/x
  3. Step 3: Cross multiply
    290,987.98x = 436,500.42 × 91,316.26
  4. Step 4: Simplify right side
    290,987.98x = 39,859,585,842.83
  5. Step 5: Solve for x
    x = 39,859,585,842.83/290,987.98
  6. Step 6: Final answer
    x = 136,980.18

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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.