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Finding the Fourth Proportional to 87,690.87, 120,984.71 and 53,663.87

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Solution

The fourth proportional to 87,690.87, 120,984.71 and 53,663.87 is: 74,038.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,690.87 : 120,984.71 = 53,663.87 : x
  2. Step 2: Convert to fraction form
    87,690.87/120,984.71 = 53,663.87/x
  3. Step 3: Cross multiply
    87,690.87x = 120,984.71 × 53,663.87
  4. Step 4: Simplify right side
    87,690.87x = 6,492,507,783.57
  5. Step 5: Solve for x
    x = 6,492,507,783.57/87,690.87
  6. Step 6: Final answer
    x = 74,038.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.