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Finding the Fourth Proportional to 1,089.32, 1,503.78 and 623.48

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Solution

The fourth proportional to 1,089.32, 1,503.78 and 623.48 is: 860.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.32 : 1,503.78 = 623.48 : x
  2. Step 2: Convert to fraction form
    1,089.32/1,503.78 = 623.48/x
  3. Step 3: Cross multiply
    1,089.32x = 1,503.78 × 623.48
  4. Step 4: Simplify right side
    1,089.32x = 937,576.75
  5. Step 5: Solve for x
    x = 937,576.75/1,089.32
  6. Step 6: Final answer
    x = 860.70

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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.