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Finding the Fourth Proportional to 72,762.57, 100,424.60 and 42,131.20

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Solution

The fourth proportional to 72,762.57, 100,424.60 and 42,131.20 is: 58,148.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,762.57 : 100,424.60 = 42,131.20 : x
  2. Step 2: Convert to fraction form
    72,762.57/100,424.60 = 42,131.20/x
  3. Step 3: Cross multiply
    72,762.57x = 100,424.60 × 42,131.20
  4. Step 4: Simplify right side
    72,762.57x = 4,231,008,907.52
  5. Step 5: Solve for x
    x = 4,231,008,907.52/72,762.57
  6. Step 6: Final answer
    x = 58,148.15

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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.