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Finding the Fourth Proportional to 66,438, 99,657.36 and 17,190

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Solution

The fourth proportional to 66,438, 99,657.36 and 17,190 is: 25,785.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,438 : 99,657.36 = 17,190 : x
  2. Step 2: Convert to fraction form
    66,438/99,657.36 = 17,190/x
  3. Step 3: Cross multiply
    66,438x = 99,657.36 × 17,190
  4. Step 4: Simplify right side
    66,438x = 1,713,110,018.40
  5. Step 5: Solve for x
    x = 1,713,110,018.40/66,438
  6. Step 6: Final answer
    x = 25,785.09

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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.