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Finding the Fourth Proportional to 42,643.76, 63,966.18 and 11,479.01

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Solution

The fourth proportional to 42,643.76, 63,966.18 and 11,479.01 is: 17,218.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,643.76 : 63,966.18 = 11,479.01 : x
  2. Step 2: Convert to fraction form
    42,643.76/63,966.18 = 11,479.01/x
  3. Step 3: Cross multiply
    42,643.76x = 63,966.18 × 11,479.01
  4. Step 4: Simplify right side
    42,643.76x = 734,268,419.88
  5. Step 5: Solve for x
    x = 734,268,419.88/42,643.76
  6. Step 6: Final answer
    x = 17,218.66

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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.