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Finding the Fourth Proportional to 85,405.40, 128,127.30 and 26,243.80

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Solution

The fourth proportional to 85,405.40, 128,127.30 and 26,243.80 is: 39,371.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.40 : 128,127.30 = 26,243.80 : x
  2. Step 2: Convert to fraction form
    85,405.40/128,127.30 = 26,243.80/x
  3. Step 3: Cross multiply
    85,405.40x = 128,127.30 × 26,243.80
  4. Step 4: Simplify right side
    85,405.40x = 3,362,547,235.74
  5. Step 5: Solve for x
    x = 3,362,547,235.74/85,405.40
  6. Step 6: Final answer
    x = 39,371.60

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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.