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Finding the Fourth Proportional to 66,487.30, 91,786.35 and 51,345.97

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Solution

The fourth proportional to 66,487.30, 91,786.35 and 51,345.97 is: 70,883.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,487.30 : 91,786.35 = 51,345.97 : x
  2. Step 2: Convert to fraction form
    66,487.30/91,786.35 = 51,345.97/x
  3. Step 3: Cross multiply
    66,487.30x = 91,786.35 × 51,345.97
  4. Step 4: Simplify right side
    66,487.30x = 4,712,859,173.51
  5. Step 5: Solve for x
    x = 4,712,859,173.51/66,487.30
  6. Step 6: Final answer
    x = 70,883.60

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1.5x scale

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.