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Finding the Fourth Proportional to 155,970.50, 215,239.07 and 87,987.40

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Solution

The fourth proportional to 155,970.50, 215,239.07 and 87,987.40 is: 121,422.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,970.50 : 215,239.07 = 87,987.40 : x
  2. Step 2: Convert to fraction form
    155,970.50/215,239.07 = 87,987.40/x
  3. Step 3: Cross multiply
    155,970.50x = 215,239.07 × 87,987.40
  4. Step 4: Simplify right side
    155,970.50x = 18,938,325,829.59
  5. Step 5: Solve for x
    x = 18,938,325,829.59/155,970.50
  6. Step 6: Final answer
    x = 121,422.49

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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.