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Finding the Fourth Proportional to 620,421.81, 856,081.72 and 387,821.53

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Solution

The fourth proportional to 620,421.81, 856,081.72 and 387,821.53 is: 535,130.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,421.81 : 856,081.72 = 387,821.53 : x
  2. Step 2: Convert to fraction form
    620,421.81/856,081.72 = 387,821.53/x
  3. Step 3: Cross multiply
    620,421.81x = 856,081.72 × 387,821.53
  4. Step 4: Simplify right side
    620,421.81x = 332,006,922,455.43
  5. Step 5: Solve for x
    x = 332,006,922,455.43/620,421.81
  6. Step 6: Final answer
    x = 535,130.97

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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.