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Finding the Fourth Proportional to 71,718.16, 98,971.16 and 39,887.08

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Solution

The fourth proportional to 71,718.16, 98,971.16 and 39,887.08 is: 55,044.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,718.16 : 98,971.16 = 39,887.08 : x
  2. Step 2: Convert to fraction form
    71,718.16/98,971.16 = 39,887.08/x
  3. Step 3: Cross multiply
    71,718.16x = 98,971.16 × 39,887.08
  4. Step 4: Simplify right side
    71,718.16x = 3,947,670,576.61
  5. Step 5: Solve for x
    x = 3,947,670,576.61/71,718.16
  6. Step 6: Final answer
    x = 55,044.23

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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.