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Finding the Fourth Proportional to 53,987.85, 81,009.12 and 36,420.78

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Solution

The fourth proportional to 53,987.85, 81,009.12 and 36,420.78 is: 54,649.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,987.85 : 81,009.12 = 36,420.78 : x
  2. Step 2: Convert to fraction form
    53,987.85/81,009.12 = 36,420.78/x
  3. Step 3: Cross multiply
    53,987.85x = 81,009.12 × 36,420.78
  4. Step 4: Simplify right side
    53,987.85x = 2,950,415,337.51
  5. Step 5: Solve for x
    x = 2,950,415,337.51/53,987.85
  6. Step 6: Final answer
    x = 54,649.62

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1.5x scale

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.