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Finding the Fourth Proportional to 72,999.72, 108,981.09 and 70,407.72

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Solution

The fourth proportional to 72,999.72, 108,981.09 and 70,407.72 is: 105,111.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,999.72 : 108,981.09 = 70,407.72 : x
  2. Step 2: Convert to fraction form
    72,999.72/108,981.09 = 70,407.72/x
  3. Step 3: Cross multiply
    72,999.72x = 108,981.09 × 70,407.72
  4. Step 4: Simplify right side
    72,999.72x = 7,673,110,070.01
  5. Step 5: Solve for x
    x = 7,673,110,070.01/72,999.72
  6. Step 6: Final answer
    x = 105,111.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.