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Finding the Fourth Proportional to 153,630.19, 211,992.55 and 85,642.03

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Solution

The fourth proportional to 153,630.19, 211,992.55 and 85,642.03 is: 118,176.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,630.19 : 211,992.55 = 85,642.03 : x
  2. Step 2: Convert to fraction form
    153,630.19/211,992.55 = 85,642.03/x
  3. Step 3: Cross multiply
    153,630.19x = 211,992.55 × 85,642.03
  4. Step 4: Simplify right side
    153,630.19x = 18,155,472,326.88
  5. Step 5: Solve for x
    x = 18,155,472,326.88/153,630.19
  6. Step 6: Final answer
    x = 118,176.46

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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.