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Finding the Fourth Proportional to 63,690.32, 87,810 and 40,988.72

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Solution

The fourth proportional to 63,690.32, 87,810 and 40,988.72 is: 56,511.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,690.32 : 87,810 = 40,988.72 : x
  2. Step 2: Convert to fraction form
    63,690.32/87,810 = 40,988.72/x
  3. Step 3: Cross multiply
    63,690.32x = 87,810 × 40,988.72
  4. Step 4: Simplify right side
    63,690.32x = 3,599,219,503.20
  5. Step 5: Solve for x
    x = 3,599,219,503.20/63,690.32
  6. Step 6: Final answer
    x = 56,511.25

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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.