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Finding the Fourth Proportional to 903.51, 1,245.87 and 624.15

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Solution

The fourth proportional to 903.51, 1,245.87 and 624.15 is: 860.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.51 : 1,245.87 = 624.15 : x
  2. Step 2: Convert to fraction form
    903.51/1,245.87 = 624.15/x
  3. Step 3: Cross multiply
    903.51x = 1,245.87 × 624.15
  4. Step 4: Simplify right side
    903.51x = 777,609.76
  5. Step 5: Solve for x
    x = 777,609.76/903.51
  6. Step 6: Final answer
    x = 860.65

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Double scale
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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.