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Finding the Fourth Proportional to 210,508.66, 315,987.78 and 90,624.94

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Solution

The fourth proportional to 210,508.66, 315,987.78 and 90,624.94 is: 136,034.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,508.66 : 315,987.78 = 90,624.94 : x
  2. Step 2: Convert to fraction form
    210,508.66/315,987.78 = 90,624.94/x
  3. Step 3: Cross multiply
    210,508.66x = 315,987.78 × 90,624.94
  4. Step 4: Simplify right side
    210,508.66x = 28,636,373,603.23
  5. Step 5: Solve for x
    x = 28,636,373,603.23/210,508.66
  6. Step 6: Final answer
    x = 136,034.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.