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Finding the Fourth Proportional to 661,324.81, 912,712.67 and 389,418.01

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Solution

The fourth proportional to 661,324.81, 912,712.67 and 389,418.01 is: 537,446.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,324.81 : 912,712.67 = 389,418.01 : x
  2. Step 2: Convert to fraction form
    661,324.81/912,712.67 = 389,418.01/x
  3. Step 3: Cross multiply
    661,324.81x = 912,712.67 × 389,418.01
  4. Step 4: Simplify right side
    661,324.81x = 355,426,751,653.19
  5. Step 5: Solve for x
    x = 355,426,751,653.19/661,324.81
  6. Step 6: Final answer
    x = 537,446.57

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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.