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Finding the Fourth Proportional to 78,572.10, 108,155.64 and 68,483.01

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Solution

The fourth proportional to 78,572.10, 108,155.64 and 68,483.01 is: 94,267.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,572.10 : 108,155.64 = 68,483.01 : x
  2. Step 2: Convert to fraction form
    78,572.10/108,155.64 = 68,483.01/x
  3. Step 3: Cross multiply
    78,572.10x = 108,155.64 × 68,483.01
  4. Step 4: Simplify right side
    78,572.10x = 7,406,823,775.68
  5. Step 5: Solve for x
    x = 7,406,823,775.68/78,572.10
  6. Step 6: Final answer
    x = 94,267.86

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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.