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Finding the Fourth Proportional to 72,699.62, 109,054.62 and 19,391.30

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Solution

The fourth proportional to 72,699.62, 109,054.62 and 19,391.30 is: 29,088.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,699.62 : 109,054.62 = 19,391.30 : x
  2. Step 2: Convert to fraction form
    72,699.62/109,054.62 = 19,391.30/x
  3. Step 3: Cross multiply
    72,699.62x = 109,054.62 × 19,391.30
  4. Step 4: Simplify right side
    72,699.62x = 2,114,710,483.21
  5. Step 5: Solve for x
    x = 2,114,710,483.21/72,699.62
  6. Step 6: Final answer
    x = 29,088.33

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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.