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Finding the Fourth Proportional to 68,712.30, 103,068.45 and 31,290.30

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Solution

The fourth proportional to 68,712.30, 103,068.45 and 31,290.30 is: 46,935.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,712.30 : 103,068.45 = 31,290.30 : x
  2. Step 2: Convert to fraction form
    68,712.30/103,068.45 = 31,290.30/x
  3. Step 3: Cross multiply
    68,712.30x = 103,068.45 × 31,290.30
  4. Step 4: Simplify right side
    68,712.30x = 3,225,042,721.04
  5. Step 5: Solve for x
    x = 3,225,042,721.04/68,712.30
  6. Step 6: Final answer
    x = 46,935.45

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Similar ratio
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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.