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Finding the Fourth Proportional to 85,307.20, 127,999.20 and 40,916.80

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Solution

The fourth proportional to 85,307.20, 127,999.20 and 40,916.80 is: 61,393.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,307.20 : 127,999.20 = 40,916.80 : x
  2. Step 2: Convert to fraction form
    85,307.20/127,999.20 = 40,916.80/x
  3. Step 3: Cross multiply
    85,307.20x = 127,999.20 × 40,916.80
  4. Step 4: Simplify right side
    85,307.20x = 5,237,317,666.56
  5. Step 5: Solve for x
    x = 5,237,317,666.56/85,307.20
  6. Step 6: Final answer
    x = 61,393.62

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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.