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Finding the Fourth Proportional to 660,553,620.40, 990,830,430.60 and 442,875,386.80

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Solution

The fourth proportional to 660,553,620.40, 990,830,430.60 and 442,875,386.80 is: 664,313,080.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,553,620.40 : 990,830,430.60 = 442,875,386.80 : x
  2. Step 2: Convert to fraction form
    660,553,620.40/990,830,430.60 = 442,875,386.80/x
  3. Step 3: Cross multiply
    660,553,620.40x = 990,830,430.60 × 442,875,386.80
  4. Step 4: Simplify right side
    660,553,620.40x = 438,814,410,205,185,600
  5. Step 5: Solve for x
    x = 438,814,410,205,185,600/660,553,620.40
  6. Step 6: Final answer
    x = 664,313,080.20

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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.