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Finding the Fourth Proportional to 870,404.40, 1,305,606.60 and 720,813.60

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Solution

The fourth proportional to 870,404.40, 1,305,606.60 and 720,813.60 is: 1,081,220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,404.40 : 1,305,606.60 = 720,813.60 : x
  2. Step 2: Convert to fraction form
    870,404.40/1,305,606.60 = 720,813.60/x
  3. Step 3: Cross multiply
    870,404.40x = 1,305,606.60 × 720,813.60
  4. Step 4: Simplify right side
    870,404.40x = 941,098,993,529.76
  5. Step 5: Solve for x
    x = 941,098,993,529.76/870,404.40
  6. Step 6: Final answer
    x = 1,081,220.40

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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.