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Finding the Fourth Proportional to 145,915.70, 218,703.45 and 67,037.90

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Solution

The fourth proportional to 145,915.70, 218,703.45 and 67,037.90 is: 100,478.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,915.70 : 218,703.45 = 67,037.90 : x
  2. Step 2: Convert to fraction form
    145,915.70/218,703.45 = 67,037.90/x
  3. Step 3: Cross multiply
    145,915.70x = 218,703.45 × 67,037.90
  4. Step 4: Simplify right side
    145,915.70x = 14,661,420,010.76
  5. Step 5: Solve for x
    x = 14,661,420,010.76/145,915.70
  6. Step 6: Final answer
    x = 100,478.70

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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.