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Finding the Fourth Proportional to 72,779.40, 100,431.36 and 40,946.94

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Solution

The fourth proportional to 72,779.40, 100,431.36 and 40,946.94 is: 56,504.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,779.40 : 100,431.36 = 40,946.94 : x
  2. Step 2: Convert to fraction form
    72,779.40/100,431.36 = 40,946.94/x
  3. Step 3: Cross multiply
    72,779.40x = 100,431.36 × 40,946.94
  4. Step 4: Simplify right side
    72,779.40x = 4,112,356,872.04
  5. Step 5: Solve for x
    x = 4,112,356,872.04/72,779.40
  6. Step 6: Final answer
    x = 56,504.41

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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.