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Finding the Fourth Proportional to 90,396.72, 135,602.64 and 31,208.40

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Solution

The fourth proportional to 90,396.72, 135,602.64 and 31,208.40 is: 46,815.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,396.72 : 135,602.64 = 31,208.40 : x
  2. Step 2: Convert to fraction form
    90,396.72/135,602.64 = 31,208.40/x
  3. Step 3: Cross multiply
    90,396.72x = 135,602.64 × 31,208.40
  4. Step 4: Simplify right side
    90,396.72x = 4,231,941,430.18
  5. Step 5: Solve for x
    x = 4,231,941,430.18/90,396.72
  6. Step 6: Final answer
    x = 46,815.21

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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.