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Finding the Fourth Proportional to 72,665.90, 100,281.48 and 40,834.16

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Solution

The fourth proportional to 72,665.90, 100,281.48 and 40,834.16 is: 56,352.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,665.90 : 100,281.48 = 40,834.16 : x
  2. Step 2: Convert to fraction form
    72,665.90/100,281.48 = 40,834.16/x
  3. Step 3: Cross multiply
    72,665.90x = 100,281.48 × 40,834.16
  4. Step 4: Simplify right side
    72,665.90x = 4,094,909,999.36
  5. Step 5: Solve for x
    x = 4,094,909,999.36/72,665.90
  6. Step 6: Final answer
    x = 56,352.57

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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.