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Finding the Fourth Proportional to 643,513.80, 965,270.70 and 539,315.40

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Solution

The fourth proportional to 643,513.80, 965,270.70 and 539,315.40 is: 808,973.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,513.80 : 965,270.70 = 539,315.40 : x
  2. Step 2: Convert to fraction form
    643,513.80/965,270.70 = 539,315.40/x
  3. Step 3: Cross multiply
    643,513.80x = 965,270.70 × 539,315.40
  4. Step 4: Simplify right side
    643,513.80x = 520,585,353,678.78
  5. Step 5: Solve for x
    x = 520,585,353,678.78/643,513.80
  6. Step 6: Final answer
    x = 808,973.10

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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.