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Finding the Fourth Proportional to 65,415.56, 90,710.02 and 63,199.40

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Solution

The fourth proportional to 65,415.56, 90,710.02 and 63,199.40 is: 87,636.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,415.56 : 90,710.02 = 63,199.40 : x
  2. Step 2: Convert to fraction form
    65,415.56/90,710.02 = 63,199.40/x
  3. Step 3: Cross multiply
    65,415.56x = 90,710.02 × 63,199.40
  4. Step 4: Simplify right side
    65,415.56x = 5,732,818,837.99
  5. Step 5: Solve for x
    x = 5,732,818,837.99/65,415.56
  6. Step 6: Final answer
    x = 87,636.93

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.