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Finding the Fourth Proportional to 78,699, 118,005.21 and 53,767.20

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Solution

The fourth proportional to 78,699, 118,005.21 and 53,767.20 is: 80,621.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699 : 118,005.21 = 53,767.20 : x
  2. Step 2: Convert to fraction form
    78,699/118,005.21 = 53,767.20/x
  3. Step 3: Cross multiply
    78,699x = 118,005.21 × 53,767.20
  4. Step 4: Simplify right side
    78,699x = 6,344,809,727.11
  5. Step 5: Solve for x
    x = 6,344,809,727.11/78,699
  6. Step 6: Final answer
    x = 80,621.22

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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.