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Finding the Fourth Proportional to 60,578.94, 90,876.78 and 21,130.32

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Solution

The fourth proportional to 60,578.94, 90,876.78 and 21,130.32 is: 31,698.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,578.94 : 90,876.78 = 21,130.32 : x
  2. Step 2: Convert to fraction form
    60,578.94/90,876.78 = 21,130.32/x
  3. Step 3: Cross multiply
    60,578.94x = 90,876.78 × 21,130.32
  4. Step 4: Simplify right side
    60,578.94x = 1,920,255,441.97
  5. Step 5: Solve for x
    x = 1,920,255,441.97/60,578.94
  6. Step 6: Final answer
    x = 31,698.40

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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.