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Finding the Fourth Proportional to 709,920.80, 1,065,172.80 and 260,856.80

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Solution

The fourth proportional to 709,920.80, 1,065,172.80 and 260,856.80 is: 391,392.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,920.80 : 1,065,172.80 = 260,856.80 : x
  2. Step 2: Convert to fraction form
    709,920.80/1,065,172.80 = 260,856.80/x
  3. Step 3: Cross multiply
    709,920.80x = 1,065,172.80 × 260,856.80
  4. Step 4: Simplify right side
    709,920.80x = 277,857,568,055.04
  5. Step 5: Solve for x
    x = 277,857,568,055.04/709,920.80
  6. Step 6: Final answer
    x = 391,392.35

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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.