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Finding the Fourth Proportional to 606.60, 909.12 and 390.24

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Solution

The fourth proportional to 606.60, 909.12 and 390.24 is: 584.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.60 : 909.12 = 390.24 : x
  2. Step 2: Convert to fraction form
    606.60/909.12 = 390.24/x
  3. Step 3: Cross multiply
    606.60x = 909.12 × 390.24
  4. Step 4: Simplify right side
    606.60x = 354,774.99
  5. Step 5: Solve for x
    x = 354,774.99/606.60
  6. Step 6: Final answer
    x = 584.86

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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.