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Finding the Fourth Proportional to 72,339.72, 99,831 and 40,509.40

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Solution

The fourth proportional to 72,339.72, 99,831 and 40,509.40 is: 55,904.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,339.72 : 99,831 = 40,509.40 : x
  2. Step 2: Convert to fraction form
    72,339.72/99,831 = 40,509.40/x
  3. Step 3: Cross multiply
    72,339.72x = 99,831 × 40,509.40
  4. Step 4: Simplify right side
    72,339.72x = 4,044,093,911.40
  5. Step 5: Solve for x
    x = 4,044,093,911.40/72,339.72
  6. Step 6: Final answer
    x = 55,904.20

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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.