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Finding the Fourth Proportional to 906.94, 1,360.77 and 420.22

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Solution

The fourth proportional to 906.94, 1,360.77 and 420.22 is: 630.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.94 : 1,360.77 = 420.22 : x
  2. Step 2: Convert to fraction form
    906.94/1,360.77 = 420.22/x
  3. Step 3: Cross multiply
    906.94x = 1,360.77 × 420.22
  4. Step 4: Simplify right side
    906.94x = 571,822.77
  5. Step 5: Solve for x
    x = 571,822.77/906.94
  6. Step 6: Final answer
    x = 630.50

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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.