Home / 420,720.06-630,858.64-287,638.38

Finding the Fourth Proportional to 420,720.06, 630,858.64 and 287,638.38

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Solution

The fourth proportional to 420,720.06, 630,858.64 and 287,638.38 is: 431,306.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,720.06 : 630,858.64 = 287,638.38 : x
  2. Step 2: Convert to fraction form
    420,720.06/630,858.64 = 287,638.38/x
  3. Step 3: Cross multiply
    420,720.06x = 630,858.64 × 287,638.38
  4. Step 4: Simplify right side
    420,720.06x = 181,459,156,556.18
  5. Step 5: Solve for x
    x = 181,459,156,556.18/420,720.06
  6. Step 6: Final answer
    x = 431,306.16

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1.5x scale

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.