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Finding the Fourth Proportional to 92,586.88, 138,090.38 and 90,987.40

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Solution

The fourth proportional to 92,586.88, 138,090.38 and 90,987.40 is: 135,704.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,586.88 : 138,090.38 = 90,987.40 : x
  2. Step 2: Convert to fraction form
    92,586.88/138,090.38 = 90,987.40/x
  3. Step 3: Cross multiply
    92,586.88x = 138,090.38 × 90,987.40
  4. Step 4: Simplify right side
    92,586.88x = 12,564,484,641.21
  5. Step 5: Solve for x
    x = 12,564,484,641.21/92,586.88
  6. Step 6: Final answer
    x = 135,704.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.