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Finding the Fourth Proportional to 86,425, 129,637.50 and 28,057

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Solution

The fourth proportional to 86,425, 129,637.50 and 28,057 is: 42,085.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,425 : 129,637.50 = 28,057 : x
  2. Step 2: Convert to fraction form
    86,425/129,637.50 = 28,057/x
  3. Step 3: Cross multiply
    86,425x = 129,637.50 × 28,057
  4. Step 4: Simplify right side
    86,425x = 3,637,239,337.50
  5. Step 5: Solve for x
    x = 3,637,239,337.50/86,425
  6. Step 6: Final answer
    x = 42,085.50

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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.