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Finding the Fourth Proportional to 42,407.40, 63,611.10 and 19,079.40

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Solution

The fourth proportional to 42,407.40, 63,611.10 and 19,079.40 is: 28,619.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,407.40 : 63,611.10 = 19,079.40 : x
  2. Step 2: Convert to fraction form
    42,407.40/63,611.10 = 19,079.40/x
  3. Step 3: Cross multiply
    42,407.40x = 63,611.10 × 19,079.40
  4. Step 4: Simplify right side
    42,407.40x = 1,213,661,621.34
  5. Step 5: Solve for x
    x = 1,213,661,621.34/42,407.40
  6. Step 6: Final answer
    x = 28,619.10

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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.