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Finding the Fourth Proportional to 104,920.80, 157,390.80 and 42,578.40

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Solution

The fourth proportional to 104,920.80, 157,390.80 and 42,578.40 is: 63,871.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,920.80 : 157,390.80 = 42,578.40 : x
  2. Step 2: Convert to fraction form
    104,920.80/157,390.80 = 42,578.40/x
  3. Step 3: Cross multiply
    104,920.80x = 157,390.80 × 42,578.40
  4. Step 4: Simplify right side
    104,920.80x = 6,701,448,438.72
  5. Step 5: Solve for x
    x = 6,701,448,438.72/104,920.80
  6. Step 6: Final answer
    x = 63,871.50

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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.