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Finding the Fourth Proportional to 661,320.81, 912,707.15 and 389,414.01

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Solution

The fourth proportional to 661,320.81, 912,707.15 and 389,414.01 is: 537,441.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,320.81 : 912,707.15 = 389,414.01 : x
  2. Step 2: Convert to fraction form
    661,320.81/912,707.15 = 389,414.01/x
  3. Step 3: Cross multiply
    661,320.81x = 912,707.15 × 389,414.01
  4. Step 4: Simplify right side
    661,320.81x = 355,420,949,290.10
  5. Step 5: Solve for x
    x = 355,420,949,290.10/661,320.81
  6. Step 6: Final answer
    x = 537,441.05

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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.