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Finding the Fourth Proportional to 61,188.32, 84,451.44 and 39,985.76

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Solution

The fourth proportional to 61,188.32, 84,451.44 and 39,985.76 is: 55,187.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,188.32 : 84,451.44 = 39,985.76 : x
  2. Step 2: Convert to fraction form
    61,188.32/84,451.44 = 39,985.76/x
  3. Step 3: Cross multiply
    61,188.32x = 84,451.44 × 39,985.76
  4. Step 4: Simplify right side
    61,188.32x = 3,376,855,011.49
  5. Step 5: Solve for x
    x = 3,376,855,011.49/61,188.32
  6. Step 6: Final answer
    x = 55,187.90

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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.