Home / 420,386.30-630,828.45-393,788.06

Finding the Fourth Proportional to 420,386.30, 630,828.45 and 393,788.06

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Solution

The fourth proportional to 420,386.30, 630,828.45 and 393,788.06 is: 590,915.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,386.30 : 630,828.45 = 393,788.06 : x
  2. Step 2: Convert to fraction form
    420,386.30/630,828.45 = 393,788.06/x
  3. Step 3: Cross multiply
    420,386.30x = 630,828.45 × 393,788.06
  4. Step 4: Simplify right side
    420,386.30x = 248,412,708,364.17
  5. Step 5: Solve for x
    x = 248,412,708,364.17/420,386.30
  6. Step 6: Final answer
    x = 590,915.34

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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.