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Finding the Fourth Proportional to 86,987.71, 130,531.79 and 47,006.82

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Solution

The fourth proportional to 86,987.71, 130,531.79 and 47,006.82 is: 70,537.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,987.71 : 130,531.79 = 47,006.82 : x
  2. Step 2: Convert to fraction form
    86,987.71/130,531.79 = 47,006.82/x
  3. Step 3: Cross multiply
    86,987.71x = 130,531.79 × 47,006.82
  4. Step 4: Simplify right side
    86,987.71x = 6,135,884,356.81
  5. Step 5: Solve for x
    x = 6,135,884,356.81/86,987.71
  6. Step 6: Final answer
    x = 70,537.37

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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.