Home / 420,929.76-631,394.09-105,386.63

Finding the Fourth Proportional to 420,929.76, 631,394.09 and 105,386.63

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Solution

The fourth proportional to 420,929.76, 631,394.09 and 105,386.63 is: 158,079.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,929.76 : 631,394.09 = 105,386.63 : x
  2. Step 2: Convert to fraction form
    420,929.76/631,394.09 = 105,386.63/x
  3. Step 3: Cross multiply
    420,929.76x = 631,394.09 × 105,386.63
  4. Step 4: Simplify right side
    420,929.76x = 66,540,495,347.02
  5. Step 5: Solve for x
    x = 66,540,495,347.02/420,929.76
  6. Step 6: Final answer
    x = 158,079.81

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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.