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Finding the Fourth Proportional to 71,718.64, 98,970.30 and 39,886.78

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Solution

The fourth proportional to 71,718.64, 98,970.30 and 39,886.78 is: 55,042.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,718.64 : 98,970.30 = 39,886.78 : x
  2. Step 2: Convert to fraction form
    71,718.64/98,970.30 = 39,886.78/x
  3. Step 3: Cross multiply
    71,718.64x = 98,970.30 × 39,886.78
  4. Step 4: Simplify right side
    71,718.64x = 3,947,606,582.63
  5. Step 5: Solve for x
    x = 3,947,606,582.63/71,718.64
  6. Step 6: Final answer
    x = 55,042.96

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1.5x scale

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.