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Finding the Fourth Proportional to 205,055.40, 307,583.10 and 86,687.40

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Solution

The fourth proportional to 205,055.40, 307,583.10 and 86,687.40 is: 130,031.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,055.40 : 307,583.10 = 86,687.40 : x
  2. Step 2: Convert to fraction form
    205,055.40/307,583.10 = 86,687.40/x
  3. Step 3: Cross multiply
    205,055.40x = 307,583.10 × 86,687.40
  4. Step 4: Simplify right side
    205,055.40x = 26,663,579,222.94
  5. Step 5: Solve for x
    x = 26,663,579,222.94/205,055.40
  6. Step 6: Final answer
    x = 130,031.10

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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.