Home / 420,815.40-631,223.10-121,269.30

Finding the Fourth Proportional to 420,815.40, 631,223.10 and 121,269.30

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Solution

The fourth proportional to 420,815.40, 631,223.10 and 121,269.30 is: 181,903.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,815.40 : 631,223.10 = 121,269.30 : x
  2. Step 2: Convert to fraction form
    420,815.40/631,223.10 = 121,269.30/x
  3. Step 3: Cross multiply
    420,815.40x = 631,223.10 × 121,269.30
  4. Step 4: Simplify right side
    420,815.40x = 76,547,983,480.83
  5. Step 5: Solve for x
    x = 76,547,983,480.83/420,815.40
  6. Step 6: Final answer
    x = 181,903.95

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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.