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Finding the Fourth Proportional to 208,615.99, 312,948.42 and 66,411.45

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Solution

The fourth proportional to 208,615.99, 312,948.42 and 66,411.45 is: 99,624.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,615.99 : 312,948.42 = 66,411.45 : x
  2. Step 2: Convert to fraction form
    208,615.99/312,948.42 = 66,411.45/x
  3. Step 3: Cross multiply
    208,615.99x = 312,948.42 × 66,411.45
  4. Step 4: Simplify right side
    208,615.99x = 20,783,358,347.41
  5. Step 5: Solve for x
    x = 20,783,358,347.41/208,615.99
  6. Step 6: Final answer
    x = 99,624.95

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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.