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Finding the Fourth Proportional to 153,170.72, 211,373.71 and 86,102.72

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Solution

The fourth proportional to 153,170.72, 211,373.71 and 86,102.72 is: 118,820.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,170.72 : 211,373.71 = 86,102.72 : x
  2. Step 2: Convert to fraction form
    153,170.72/211,373.71 = 86,102.72/x
  3. Step 3: Cross multiply
    153,170.72x = 211,373.71 × 86,102.72
  4. Step 4: Simplify right side
    153,170.72x = 18,199,850,095.37
  5. Step 5: Solve for x
    x = 18,199,850,095.37/153,170.72
  6. Step 6: Final answer
    x = 118,820.69

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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.