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Finding the Fourth Proportional to 66,415.65, 99,638.07 and 19,672.17

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Solution

The fourth proportional to 66,415.65, 99,638.07 and 19,672.17 is: 29,512.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,415.65 : 99,638.07 = 19,672.17 : x
  2. Step 2: Convert to fraction form
    66,415.65/99,638.07 = 19,672.17/x
  3. Step 3: Cross multiply
    66,415.65x = 99,638.07 × 19,672.17
  4. Step 4: Simplify right side
    66,415.65x = 1,960,097,051.51
  5. Step 5: Solve for x
    x = 1,960,097,051.51/66,415.65
  6. Step 6: Final answer
    x = 29,512.58

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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.