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Finding the Fourth Proportional to 72,261.84, 99,721.32 and 40,430.76

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Solution

The fourth proportional to 72,261.84, 99,721.32 and 40,430.76 is: 55,794.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,261.84 : 99,721.32 = 40,430.76 : x
  2. Step 2: Convert to fraction form
    72,261.84/99,721.32 = 40,430.76/x
  3. Step 3: Cross multiply
    72,261.84x = 99,721.32 × 40,430.76
  4. Step 4: Simplify right side
    72,261.84x = 4,031,808,755.80
  5. Step 5: Solve for x
    x = 4,031,808,755.80/72,261.84
  6. Step 6: Final answer
    x = 55,794.44

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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.