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Finding the Fourth Proportional to 903.02, 1,245.78 and 553.50

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Solution

The fourth proportional to 903.02, 1,245.78 and 553.50 is: 763.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.02 : 1,245.78 = 553.50 : x
  2. Step 2: Convert to fraction form
    903.02/1,245.78 = 553.50/x
  3. Step 3: Cross multiply
    903.02x = 1,245.78 × 553.50
  4. Step 4: Simplify right side
    903.02x = 689,539.23
  5. Step 5: Solve for x
    x = 689,539.23/903.02
  6. Step 6: Final answer
    x = 763.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.