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Finding the Fourth Proportional to 101,157.92, 139,663.68 and 90,529.28

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Solution

The fourth proportional to 101,157.92, 139,663.68 and 90,529.28 is: 124,989.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,157.92 : 139,663.68 = 90,529.28 : x
  2. Step 2: Convert to fraction form
    101,157.92/139,663.68 = 90,529.28/x
  3. Step 3: Cross multiply
    101,157.92x = 139,663.68 × 90,529.28
  4. Step 4: Simplify right side
    101,157.92x = 12,643,652,392.55
  5. Step 5: Solve for x
    x = 12,643,652,392.55/101,157.92
  6. Step 6: Final answer
    x = 124,989.25

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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.