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Finding the Fourth Proportional to 90,417.88, 135,435.93 and 72,551.71

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Solution

The fourth proportional to 90,417.88, 135,435.93 and 72,551.71 is: 108,674.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,417.88 : 135,435.93 = 72,551.71 : x
  2. Step 2: Convert to fraction form
    90,417.88/135,435.93 = 72,551.71/x
  3. Step 3: Cross multiply
    90,417.88x = 135,435.93 × 72,551.71
  4. Step 4: Simplify right side
    90,417.88x = 9,826,108,316.94
  5. Step 5: Solve for x
    x = 9,826,108,316.94/90,417.88
  6. Step 6: Final answer
    x = 108,674.39

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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.