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Finding the Fourth Proportional to 153,103.65, 211,386.15 and 136,920.66

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Solution

The fourth proportional to 153,103.65, 211,386.15 and 136,920.66 is: 189,042.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,103.65 : 211,386.15 = 136,920.66 : x
  2. Step 2: Convert to fraction form
    153,103.65/211,386.15 = 136,920.66/x
  3. Step 3: Cross multiply
    153,103.65x = 211,386.15 × 136,920.66
  4. Step 4: Simplify right side
    153,103.65x = 28,943,131,172.86
  5. Step 5: Solve for x
    x = 28,943,131,172.86/153,103.65
  6. Step 6: Final answer
    x = 189,042.72

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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.