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Finding the Fourth Proportional to 63,689.32, 87,808.62 and 40,987.72

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Solution

The fourth proportional to 63,689.32, 87,808.62 and 40,987.72 is: 56,509.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,689.32 : 87,808.62 = 40,987.72 : x
  2. Step 2: Convert to fraction form
    63,689.32/87,808.62 = 40,987.72/x
  3. Step 3: Cross multiply
    63,689.32x = 87,808.62 × 40,987.72
  4. Step 4: Simplify right side
    63,689.32x = 3,599,075,130.15
  5. Step 5: Solve for x
    x = 3,599,075,130.15/63,689.32
  6. Step 6: Final answer
    x = 56,509.87

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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.