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Finding the Fourth Proportional to 58,659.40, 87,997.20 and 21,210.40

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Solution

The fourth proportional to 58,659.40, 87,997.20 and 21,210.40 is: 31,818.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,659.40 : 87,997.20 = 21,210.40 : x
  2. Step 2: Convert to fraction form
    58,659.40/87,997.20 = 21,210.40/x
  3. Step 3: Cross multiply
    58,659.40x = 87,997.20 × 21,210.40
  4. Step 4: Simplify right side
    58,659.40x = 1,866,455,810.88
  5. Step 5: Solve for x
    x = 1,866,455,810.88/58,659.40
  6. Step 6: Final answer
    x = 31,818.53

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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.