Home / 420,386.55-630,828.83-393,788.31

Finding the Fourth Proportional to 420,386.55, 630,828.83 and 393,788.31

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Solution

The fourth proportional to 420,386.55, 630,828.83 and 393,788.31 is: 590,915.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,386.55 : 630,828.83 = 393,788.31 : x
  2. Step 2: Convert to fraction form
    420,386.55/630,828.83 = 393,788.31/x
  3. Step 3: Cross multiply
    420,386.55x = 630,828.83 × 393,788.31
  4. Step 4: Simplify right side
    420,386.55x = 248,413,018,864.98
  5. Step 5: Solve for x
    x = 248,413,018,864.98/420,386.55
  6. Step 6: Final answer
    x = 590,915.72

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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.