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Finding the Fourth Proportional to 72,438.71, 99,959.67 and 40,603.28

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Solution

The fourth proportional to 72,438.71, 99,959.67 and 40,603.28 is: 56,029.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,438.71 : 99,959.67 = 40,603.28 : x
  2. Step 2: Convert to fraction form
    72,438.71/99,959.67 = 40,603.28/x
  3. Step 3: Cross multiply
    72,438.71x = 99,959.67 × 40,603.28
  4. Step 4: Simplify right side
    72,438.71x = 4,058,689,969.92
  5. Step 5: Solve for x
    x = 4,058,689,969.92/72,438.71
  6. Step 6: Final answer
    x = 56,029.30

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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.