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Finding the Fourth Proportional to 79,689.72, 109,966.86 and 47,851.32

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Solution

The fourth proportional to 79,689.72, 109,966.86 and 47,851.32 is: 66,031.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,689.72 : 109,966.86 = 47,851.32 : x
  2. Step 2: Convert to fraction form
    79,689.72/109,966.86 = 47,851.32/x
  3. Step 3: Cross multiply
    79,689.72x = 109,966.86 × 47,851.32
  4. Step 4: Simplify right side
    79,689.72x = 5,262,059,407.26
  5. Step 5: Solve for x
    x = 5,262,059,407.26/79,689.72
  6. Step 6: Final answer
    x = 66,031.85

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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.