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Finding the Fourth Proportional to 660,879,139.60, 990,468,403.80 and 401,819,366.80

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Solution

The fourth proportional to 660,879,139.60, 990,468,403.80 and 401,819,366.80 is: 602,212,058.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,879,139.60 : 990,468,403.80 = 401,819,366.80 : x
  2. Step 2: Convert to fraction form
    660,879,139.60/990,468,403.80 = 401,819,366.80/x
  3. Step 3: Cross multiply
    660,879,139.60x = 990,468,403.80 × 401,819,366.80
  4. Step 4: Simplify right side
    660,879,139.60x = 397,989,386,850,322,688
  5. Step 5: Solve for x
    x = 397,989,386,850,322,688/660,879,139.60
  6. Step 6: Final answer
    x = 602,212,058.16

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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.