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Finding the Fourth Proportional to 72,009.78, 99,345.78 and 45,105.45

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Solution

The fourth proportional to 72,009.78, 99,345.78 and 45,105.45 is: 62,228.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,009.78 : 99,345.78 = 45,105.45 : x
  2. Step 2: Convert to fraction form
    72,009.78/99,345.78 = 45,105.45/x
  3. Step 3: Cross multiply
    72,009.78x = 99,345.78 × 45,105.45
  4. Step 4: Simplify right side
    72,009.78x = 4,481,036,112.50
  5. Step 5: Solve for x
    x = 4,481,036,112.50/72,009.78
  6. Step 6: Final answer
    x = 62,228.16

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1.5x scale

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.