Home / 431,081,979.40-646,622,969.10-212,836,875.40

Finding the Fourth Proportional to 431,081,979.40, 646,622,969.10 and 212,836,875.40

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Solution

The fourth proportional to 431,081,979.40, 646,622,969.10 and 212,836,875.40 is: 319,255,313.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,081,979.40 : 646,622,969.10 = 212,836,875.40 : x
  2. Step 2: Convert to fraction form
    431,081,979.40/646,622,969.10 = 212,836,875.40/x
  3. Step 3: Cross multiply
    431,081,979.40x = 646,622,969.10 × 212,836,875.40
  4. Step 4: Simplify right side
    431,081,979.40x = 137,625,212,305,114,752
  5. Step 5: Solve for x
    x = 137,625,212,305,114,752/431,081,979.40
  6. Step 6: Final answer
    x = 319,255,313.10

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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.