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Finding the Fourth Proportional to 86,646.99, 129,674.76 and 72,622.86

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Solution

The fourth proportional to 86,646.99, 129,674.76 and 72,622.86 is: 108,686.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,646.99 : 129,674.76 = 72,622.86 : x
  2. Step 2: Convert to fraction form
    86,646.99/129,674.76 = 72,622.86/x
  3. Step 3: Cross multiply
    86,646.99x = 129,674.76 × 72,622.86
  4. Step 4: Simplify right side
    86,646.99x = 9,417,351,941.01
  5. Step 5: Solve for x
    x = 9,417,351,941.01/86,646.99
  6. Step 6: Final answer
    x = 108,686.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.