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Finding the Fourth Proportional to 108,987.19, 150,415.76 and 61,239.50

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Solution

The fourth proportional to 108,987.19, 150,415.76 and 61,239.50 is: 84,518.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,987.19 : 150,415.76 = 61,239.50 : x
  2. Step 2: Convert to fraction form
    108,987.19/150,415.76 = 61,239.50/x
  3. Step 3: Cross multiply
    108,987.19x = 150,415.76 × 61,239.50
  4. Step 4: Simplify right side
    108,987.19x = 9,211,385,934.52
  5. Step 5: Solve for x
    x = 9,211,385,934.52/108,987.19
  6. Step 6: Final answer
    x = 84,518.06

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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.