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Finding the Fourth Proportional to 68,775.32, 94,860.78 and 63,128

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Solution

The fourth proportional to 68,775.32, 94,860.78 and 63,128 is: 87,071.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,775.32 : 94,860.78 = 63,128 : x
  2. Step 2: Convert to fraction form
    68,775.32/94,860.78 = 63,128/x
  3. Step 3: Cross multiply
    68,775.32x = 94,860.78 × 63,128
  4. Step 4: Simplify right side
    68,775.32x = 5,988,371,319.84
  5. Step 5: Solve for x
    x = 5,988,371,319.84/68,775.32
  6. Step 6: Final answer
    x = 87,071.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.