Home / 72,138.71-99,549.51-40,307.87

Finding the Fourth Proportional to 72,138.71, 99,549.51 and 40,307.87

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Solution

The fourth proportional to 72,138.71, 99,549.51 and 40,307.87 is: 55,623.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,138.71 : 99,549.51 = 40,307.87 : x
  2. Step 2: Convert to fraction form
    72,138.71/99,549.51 = 40,307.87/x
  3. Step 3: Cross multiply
    72,138.71x = 99,549.51 × 40,307.87
  4. Step 4: Simplify right side
    72,138.71x = 4,012,628,707.64
  5. Step 5: Solve for x
    x = 4,012,628,707.64/72,138.71
  6. Step 6: Final answer
    x = 55,623.79

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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.