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Finding the Fourth Proportional to 290,984.61, 436,495.36 and 91,312.87

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Solution

The fourth proportional to 290,984.61, 436,495.36 and 91,312.87 is: 136,975.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,984.61 : 436,495.36 = 91,312.87 : x
  2. Step 2: Convert to fraction form
    290,984.61/436,495.36 = 91,312.87/x
  3. Step 3: Cross multiply
    290,984.61x = 436,495.36 × 91,312.87
  4. Step 4: Simplify right side
    290,984.61x = 39,857,644,209.41
  5. Step 5: Solve for x
    x = 39,857,644,209.41/290,984.61
  6. Step 6: Final answer
    x = 136,975.10

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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.