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Finding the Fourth Proportional to 661,878,831.36, 985,004,795.52 and 639,810,647.04

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Solution

The fourth proportional to 661,878,831.36, 985,004,795.52 and 639,810,647.04 is: 952,163,033.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,878,831.36 : 985,004,795.52 = 639,810,647.04 : x
  2. Step 2: Convert to fraction form
    661,878,831.36/985,004,795.52 = 639,810,647.04/x
  3. Step 3: Cross multiply
    661,878,831.36x = 985,004,795.52 × 639,810,647.04
  4. Step 4: Simplify right side
    661,878,831.36x = 630,216,555,559,154,048
  5. Step 5: Solve for x
    x = 630,216,555,559,154,048/661,878,831.36
  6. Step 6: Final answer
    x = 952,163,033.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.