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Finding the Fourth Proportional to 85,136.40, 127,718.10 and 28,981.80

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Solution

The fourth proportional to 85,136.40, 127,718.10 and 28,981.80 is: 43,477.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,136.40 : 127,718.10 = 28,981.80 : x
  2. Step 2: Convert to fraction form
    85,136.40/127,718.10 = 28,981.80/x
  3. Step 3: Cross multiply
    85,136.40x = 127,718.10 × 28,981.80
  4. Step 4: Simplify right side
    85,136.40x = 3,701,500,430.58
  5. Step 5: Solve for x
    x = 3,701,500,430.58/85,136.40
  6. Step 6: Final answer
    x = 43,477.30

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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.