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Finding the Fourth Proportional to 61,686.90, 86,186.70 and 61,686.90

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Solution

The fourth proportional to 61,686.90, 86,186.70 and 61,686.90 is: 86,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,686.90 : 86,186.70 = 61,686.90 : x
  2. Step 2: Convert to fraction form
    61,686.90/86,186.70 = 61,686.90/x
  3. Step 3: Cross multiply
    61,686.90x = 86,186.70 × 61,686.90
  4. Step 4: Simplify right side
    61,686.90x = 5,316,590,344.23
  5. Step 5: Solve for x
    x = 5,316,590,344.23/61,686.90
  6. Step 6: Final answer
    x = 86,186.70

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.