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Finding the Fourth Proportional to 98,573.70, 147,860.55 and 78,890.70

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Solution

The fourth proportional to 98,573.70, 147,860.55 and 78,890.70 is: 118,336.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,573.70 : 147,860.55 = 78,890.70 : x
  2. Step 2: Convert to fraction form
    98,573.70/147,860.55 = 78,890.70/x
  3. Step 3: Cross multiply
    98,573.70x = 147,860.55 × 78,890.70
  4. Step 4: Simplify right side
    98,573.70x = 11,664,822,291.89
  5. Step 5: Solve for x
    x = 11,664,822,291.89/98,573.70
  6. Step 6: Final answer
    x = 118,336.05

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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.