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Finding the Fourth Proportional to 520,021.90, 778,720.65 and 415,045.90

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Solution

The fourth proportional to 520,021.90, 778,720.65 and 415,045.90 is: 621,521.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,021.90 : 778,720.65 = 415,045.90 : x
  2. Step 2: Convert to fraction form
    520,021.90/778,720.65 = 415,045.90/x
  3. Step 3: Cross multiply
    520,021.90x = 778,720.65 × 415,045.90
  4. Step 4: Simplify right side
    520,021.90x = 323,204,813,027.84
  5. Step 5: Solve for x
    x = 323,204,813,027.84/520,021.90
  6. Step 6: Final answer
    x = 621,521.54

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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.