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Finding the Fourth Proportional to 660,667.46, 991,148.80 and 211,415.28

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Solution

The fourth proportional to 660,667.46, 991,148.80 and 211,415.28 is: 317,170.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,667.46 : 991,148.80 = 211,415.28 : x
  2. Step 2: Convert to fraction form
    660,667.46/991,148.80 = 211,415.28/x
  3. Step 3: Cross multiply
    660,667.46x = 991,148.80 × 211,415.28
  4. Step 4: Simplify right side
    660,667.46x = 209,544,001,073.66
  5. Step 5: Solve for x
    x = 209,544,001,073.66/660,667.46
  6. Step 6: Final answer
    x = 317,170.16

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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.