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Finding the Fourth Proportional to 72,631.46, 99,999.69 and 61,978.34

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Solution

The fourth proportional to 72,631.46, 99,999.69 and 61,978.34 is: 85,332.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,631.46 : 99,999.69 = 61,978.34 : x
  2. Step 2: Convert to fraction form
    72,631.46/99,999.69 = 61,978.34/x
  3. Step 3: Cross multiply
    72,631.46x = 99,999.69 × 61,978.34
  4. Step 4: Simplify right side
    72,631.46x = 6,197,814,786.71
  5. Step 5: Solve for x
    x = 6,197,814,786.71/72,631.46
  6. Step 6: Final answer
    x = 85,332.37

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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.