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Finding the Fourth Proportional to 81,987.71, 113,146.54 and 45,689.20

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Solution

The fourth proportional to 81,987.71, 113,146.54 and 45,689.20 is: 63,053.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,987.71 : 113,146.54 = 45,689.20 : x
  2. Step 2: Convert to fraction form
    81,987.71/113,146.54 = 45,689.20/x
  3. Step 3: Cross multiply
    81,987.71x = 113,146.54 × 45,689.20
  4. Step 4: Simplify right side
    81,987.71x = 5,169,574,895.37
  5. Step 5: Solve for x
    x = 5,169,574,895.37/81,987.71
  6. Step 6: Final answer
    x = 63,053.05

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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.