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Finding the Fourth Proportional to 870,021.60, 1,220,829.60 and 870,021.60

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Solution

The fourth proportional to 870,021.60, 1,220,829.60 and 870,021.60 is: 1,220,829.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,021.60 : 1,220,829.60 = 870,021.60 : x
  2. Step 2: Convert to fraction form
    870,021.60/1,220,829.60 = 870,021.60/x
  3. Step 3: Cross multiply
    870,021.60x = 1,220,829.60 × 870,021.60
  4. Step 4: Simplify right side
    870,021.60x = 1,062,148,121,919.36
  5. Step 5: Solve for x
    x = 1,062,148,121,919.36/870,021.60
  6. Step 6: Final answer
    x = 1,220,829.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.